hahah it's the same with me!
I'm 21 and I get asked for ID to trade in games (need to be 15).
I had the a similar situation with my hair recently too.
I just got too pissed off with how girly I look (mind you I really do like like a 13 year old boy) but since i couldn't just lop my tits off there and then, I decided to take the scissors to my hair.
Suprisingly, it doesn't look too bad. I gave myself a more messy, boyish cut and when I got to training that night people kept saying how girly I look!
Guess I must have missed the mark a little bit.