Marija, you go excellent work. You've got the eye. Take your work that you have on Flickr and print a few - mainly to understand how the printed image will look. You have enough to put together a theme. When I originally joined my local camera club, I felt very intimidated at the beginning. There were people there with so much experience, so much good gear! And then, looking that the images in the competitions - I found that the range of ability was very wide. Certainly some images were breath-takingly beautiful. But so many more were "pretty" but rather conventional and formulaic. So many were trying to imitate other images that they saw and admired. When I put my images up in the competitions, they actually were somewhere in the middle of the pack - not the best, but certainly not the worse either. I would say your eye is actually better than mine, and your processing skills are better as well. Put on your brave face, print some of your images and share them. Remember, the only things they can give you are their opinions.
You ARE a photographer. You don't need to convince anyone of that. You do want to share and learn. That's what it is all about.