Buy a shirt with "FBI: Female Body Inspector" printed on the front. Trust me, chick magnet. Or if you've already got a girlfriend, a real relationship builder.
But on a serious note, I've felt like this sometimes. But I just remind myself of all the other good things I've got going, like my friends and stuff, and that I'll be at uni in a few months anyway, so an oppurtunity for a new start there to achieve things like that. And what's a few months to wait when you're a 17 year old guy? Ahem.... maybe a bad example.