Seriously dude. You're 15 years old. Your hair looks FINE - great even. At this point in your life you should be doing what everyone else does:
a) stealing booze and beer from your parents to share with friends (don't tell em i told you to do it!)
b) making out with chicks and trying to round the bases entirely
c) generally have fun and not care about anything else
This is the time in your life where everything is still new and exciting. You should be out enjoying it, not listening to some loser who plays Warcraft all day tell you that the sky is falling. If you take his advice and get upset over nothing you'll end up just another loser like him.
Go out and have fun, it's what adolescence is for.