Daniel,
A year is not much time to get skilled in any art and your shots are generally much better than most other new photographers. Most of them are, unfortunately, essentially copies of what millions have shot before, sunrises or sunsets, bridges tapering off into the sunset. The big challenge is not shooting cliches - and that is difficult and takes time ...
Daniel, IMO the first step in improving your performance in any field is to identify what you are not presently doing to the best of your ability.
You've not done this for us. Had you said, for instance, "I'm not happy with the use of color ... ", or, "My photos tend to look flat and two dimensional ... ", we would have a few ideas to work with. We could agree or disagree and we could begin a discussion of just what you are seeing that can be improved upon.
Therefore, I wonder if you have done this at all. That is, look at what is sub-par in your results. A student will learn as much about how to improve their performance when they realize their mistakes as they will learn from their accomplishments.
It would be interesting to us, I think, if you told us what you see in your own photos.
What are your proud of? What are you unhappy with?
Looking at your portfolios, I would say you first need to address the manner in which you view the subject(s) of your images. I can't tell by looking at your examples whether you've set your camera to fully automatic mode or you simply have not adjusted the settings off of about f-11.
Each of your photos is similar to the next because they have no diversity of expression. "Expression" being the photographer's technique for drawing the viewer's eye toward an interesting subject. "Expression" being what the photographer wants the viewer to see inside and feel about their image and the subject of that shot.
Your images are, in terms of composition, very simple and very much alike one after the other.
The technical merits of your shots are exclusively of the same style which, therefore, says little about your thinking before you snapped the shutter.
This is a very common phase for young student photographers, you are taking snapshots, not photos. You're not really seeing and you're not really thinking about what your results will be. Like a young acting student you do not yet grasp how to say the line, "To be or not to be".
Is it a shout? Or, a whisper?
Is it internalized? Or, externalized?
Is it a question? Or, a statement of fact?
Is it angry? Or painfully sad?
To have intent as an actor, you must first decide what it is you are saying to the listener. The listener wants to know why you are saying these things.
To have intent with your camera, you must first decide what it is you are saying to your viewer. The viewer wants to know why they should bother looking at your snapshots. Today's viewer is overloaded with visual content. To stand apart from the multitude of images they will encounter, there must be a reason for them to look more intently and for a longer period of time at your intentions. As the photographer, you are in control of what the viewer takes away from your images.
To communicate anything to another person, you must have an intention behind your expression. You have yet to reach the stage of development where you can control your expressions and so your results are at a very elementary level. That is simply a common place to be when you are still a student.
The Traveler is quite correct when he says you are taking the same photos thousands of others have taken prior to your arrival on the scene. When a few thousand photographer's have taken "that" photo before you get your chance, your challenge, if you want to have a photo that is your own, is to look at the subject in a way that most other photographer's have ignored. Or possibly, to go where they have not looked. Or, maybe, they simply haven't considered just what their camera is capable of putting out. It is your job as a photographer to think, to observe and to make special your thoughts on the subject and to couple that to what your camera can turn out as your singular image.
You have a camera, it is your tool. You have your imagination, it is your controlling factor in what the viewer takes away from your efforts.
Your "thoughts" are what photography is about if you want to be better than average.
IMO your photos are largely absent thought. You see the same subjects others have seen and you take a photo that is very much like what others take. Then you look at the photos of a more skilled photographer and you see they have expressed their personality, their thinking and their intentions through their images.
There is a large gap between the two ways each photo was taken.
To pause here for the moment, your "depression" over what you see from others is a wasted energy source. Most of us require some positive energy to fuel our desire to improve. In any attempt to learn a subject, and certainly in the desire to master a performance, you must see what is at the end of the journey and concentrate on that rather than your misery at the moment of hitting a plateau in your process.
Plateau's are typical of the process and any student musician experiences another plateau on a regular schedule. Music is a language which you must learn and master in order to express your thoughts fluently to the listener. So too is photography a language which you must learn to control in order to show the viewer what you feel is unique in your images. IMO you've not done that yet. Your language skills are at an elementary level and you are looking at the output of those people with far more experience and much greater understanding of the process of visual communication and therefore seeing where you want to be. You need a plan on how to get to that level.
At the age of 16 and with only one year's experience under your belt, there is simply no need to become depressed. You have a lifetime of learning and experiences ahead of you. Where any of us are at right now is not where we will be in another year's time. That is true for any photographer no matter their experience level. So ditch the depression and concentrate on what is ahead of you, not what is behind you.
Your images show an interest and an awareness in "line" as a tool of your compositions. Yet you show little concern for other elements of composition. Therefore, exploring composition is your first movement forward.
Comprehending the successful positioning of negative space is essential to the use of line in composition. In other words, seeing into the spaces where there is nothing is one technique you have at your disposal when employing "line" to manipulate the viewer's imagination. You are only seeing what is, not what is yet to be discovered by closer examination.
If you want to use line as a tool, you must show the viewer where the line begins and ends and why it does so. What is it the line is meant to do for the viewer? If it is only to say there are lines, then you've said nothing with your photograph. If the line is not starting at a point of interest and is not leading the viewer to another point of interest, then you have not started the viewer on a journey to find what interesting ideas exists within your image.
Most of your shots show us a major line that begins or ends in the center of the image and ends at a point where there is no pay off for the viewer. The rule of thirds is too easily overworked in any photographer's portfolio.
Wide open blue skies are simply not very interesting. Buildings converging into a wide open blue sky have no pay off for the viewer. Similarly, bridges which start in open water and end in open sky are telling the viewer you have nothing to say about the existence of what you have photographed.
You are seeing without thinking and snapping a photo that is always going to look like everyone else's photograph because they too have put no thought into what they are doing.
You're taking snapshots, not making images.
"Snap" the bridge shot.
"Snap", the building shot.
"Snap" this and "snap" that.
If you want better than average photographs, you have to begin with better than average ideas of what it is you are showing the viewer.
If you can't wait for a sky full of drama, then what is your point of view, your intent, behind showing a shot of buildings converging upward? And that is not to say you need dramatic skies in every photo. You need clear thoughts and certainty in your intentions for taking the photo more than anything else. The rest is left to the viewer to create in their own imagination. You must simply start the ball rolling for the viewer to complete the effort. If you don't think, neither will the viewer. It's as simple as that.
Take a course, whether at school or on line, in composition. There are more elements to the subject than simply lines.
Take your time before you shoot. There are multiple ways to force yourself to look for a few moments before you simply "snap" the shutter. Read the archives of the forum for those suggestions. One technique is to use a fixed focal length prime lens (or to set your zoom lens to a single, fixed focal length) and then force yourself to examine a subject from enough angles and distances to get yourself thinking about what it is you are really trying to show the viewer.
Visualize what your viewer will see in your shot. They are your audience and, just as a musician must play to their listeners, a photographer must work to show their viewer the intent of their thinking.
Take your camera off automatic.
Your camera hopefully has some controls over which you can exert your will. Again, everything you've shown us appears to be shot with a camera that hasn't changed. If you are using a fixed focal length, then what other controls do you have at your disposal to use as tools of expression?
Learn your tools and use them to their fullest extent. If every shot is controlled by the camera, then you may have very little input into the image other than your ability to look beyond the obvious. Wonderfully interesting photos can be taken with the simplest of cameras but they require the most insightful photographer to see beyond the limits of their equipment. If your camera lacks controls, you must compensate by making your vision even more interesting before you simply "snap" the shot.
You've also not told us what you are doing in order to improve your photography. If you are only snapping shots and hoping for better results, then you are wasting time. Learn photography, all of it. No one comes at this with a complete knowledge of photography. We all began at the same level and we all developed our own skills through our efforts and our intent to become more knowledgeable.
Take a course or do your studies on line. But you must work at this everyday.
You don't necessarily need your camera to do this work. Visualize and think about what would make an interesting shot when you see a subject that catches your interest. If all you come up with is something you and a thousand other people with a camera have already done, then that is what your photograph would show.
If you do not want to be ordinary, you must see things in an interesting manner. That begins with your thoughts about the subject in front of you long before you "snap" the shutter.
If "ordinary" is the best you can come up with, you need to think more and find what is special in your shot that isn't the most common way to take the photo.
Visualize the result, not the subject. Show us your intentions for us as your audience, not just another snapshot of another subject we've seen a thousand times before.
To grow you must have a plan. Do you have a plan?