You're making such a big deal out of nothing. Yeah, I was 15 when I started and guess what? I couldn't play at AA games, either. The rules apply to all of us. I played back yard games with my friends, we did all the really stupid things that every 15yo thinks will be cool, and we learned through experience what to do and what not to do with an airsoft gun.
And then guess what happened? Time passed, like it has a tendency to do, and I turned 18. I was able to go to some bigger games, attend Lion Claws (which rocked, thanks everyone for making it a great game) and now I'm planning on going to Bulldog. It sucks a little bit when you're reading about all the big games going on and you can't go, but I think it worked out well. It forces you to mature on your own so that by the time you start going to AA games, you've learned how to act.