Try again when you're 16. It'll be slightly easier but being 18+ is the best way to get access to public games/venues. If UA has that policy then go there and give them your business if some other field says 18+ then wait until then to give them your money.
Seriously, worry about picking up hot chicks, what you're going to wear to school the next day, or doing other hobbies for now. You're only young once.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE