Hi Mercutio,
I understand how you feel, when I was in Highschool I hung out with a lot of girls who were "perfect". To this day I'm still dieting, worrying what they think about me and all that painful stuff. But I've come a long way, I've learned that if you let other people dictate how you feel you can never truly be happy . It's hard to not care but a good start is to act confident even when your not, and if you have nothing to offer than just listen (you'll be surprised at how much people crave an interested listener). I avoid the people who make me feel inadequete and so should you. It hard to end a friendship but it's even harder on you if you don't.
I hope this helps