Bonfires...

So one of my close friends just invited me to a bonfire at some kid named Kevin's place. I told her I prolly wouldn't go because I don't know who Kevin is. Reguardless I'm still invited....and now I am going  to be left at home on a Friday evening feeling like a loser. I'd go to this bonfire, but I can't drink. I mean I could, but realistically I can't and shouldn't. My friends, I know, plan to play beer pong and stay the night, which of course sounds like a ton of fun....well with the right people it could be lol. But while everyone else is getting wasted and having a ton of fun, I'll feel like I don't belong. I can't relate to them in this sense and it's ok, I'm not mad at my friends for going to parties, I'm just afraid that I'm slowly loosing them to the "cool" scene. I know I'm in college, not highschool, but still I can't help but feel sometimes that I don't fit in.