NO WAY!
If you're 11, make friends with ALL the girls... in a couple years good things will happen.
I'll also agree about being careful with booze, that's how bad things happen! Speaking of booze, I remember talking to an old guy whose strategy was to be a drunk so that when he has drinks with a girl she gets drunk much faster than he does. Quite the creeper.
The very act of approaching and talking with a girl implies interest. Nothing special needed, I've said some pretty dumb things and it didn't seem to matter. Many girls WILL play games, one girl used to piss me off every day until I snapped on her, turns out she liked me (what

). Don't accept the BS but don't take it too seriously either, you'd be surprised how often you can turn a bad situation good with a playful attitude.