Most Helpful Guy
I wouldn't worry about it. You're young and stunningly beautiful - just carry your driver's license with you; you'll need it for some time. You'll be that girl who's still being (seriously) carded when you're 35, much to the envy of those around you. Yes, you do look young now, but once that first guy gets up the guts to talk to you and everyone else realizes that you didn't sneak in underage, they'll be lining up in droves to talk to you.
Looking younger may suck now, but trust me; soon enough, you'll come to enjoy it!