My primary concern is that the venue has a 9 0'clock curfew for the under-21 crowd, of which I am a part. These concerts never end until 10:30 or 11, so I don't know if there would be an issue there. If anyone has had similar experiences, I'd love to hear what happened.
You're getting some bad advice. Maybe no one else here shoots any music. There are some issues here, and your age IS the biggest. Sure you can ask if you can shoot the show. But usually passes are handed out sparingly, and it generally depends on what you can do for them. How is it an advantage to let you in the pit? As you want to shoot to learn, and you really do need to learn quite a bit about shooting shows, that's not something that helps them. Nowadays, passes usually aren't issued to someone just hoping to develop skills or expand their portfolios. Usually the photogs are shooting for a publication, and the station probably has experienced people shooting for them.
Concert photography today almost always involves releases that spell out what you can shoot, where you can shoot from, who you are shooting for, and most importantly, who retains what rights to the images. It's a legal document. Not only are you part of the under-21 crowd, you are under 18. You are too young to legally enter into a contract. Releases are usually presented right before the show; if the station was to agree to this, which is unlikely, you'd need a parent there to sign the contract as you are a minor.
If you do ask about doing this, it's really important you let the station know before you talk about anything else that you are a minor. Realistically, they can't wave the venue's age requirement. 21 and up generally means there is alcohol involved. Liquor license regulations are strict, and as a minor, you can't be there. The venue isn't going to risk the ramifications of having a 17 yr old on the premises. the station would be foolish to risk their relationship with the venue... and you definitely don't want to lie about your age. That'll only make it less likely that you will ever get taken seriously at this.
I don't know what state you are in, so I don't know how big these concerts are. Even if you were old enough to ask and possibly get into these events, I'd hold off. Passes are generally arranged by email; normally by the publication you would be shooting for. If on spec, you'd send a link to your website, portfolio, etc. I would HIGHLY recommend waiting, and doing a lot more practicing until you have a much stronger set of images to present. Shoot events you can get access to like school events. You are just starting and have to learn more about framing and especially exposure. Take some of that time to work on developing your post production skills. There are an awful lot of blue and red images on that page.
As for making a little money on music photography, the key word is little. It's an area that is in serious trouble and getting worse every day. Bands starting out will say they don't have the budget, big bands want images for free and all your rights, and fans think they don't have to pay and will swipe images...
I'm not trying to be mean, but I'm being real.