Weird... Friend of mine had no alcohol at his 18th birthday party 2weeks ago, not to mention no cigarettes or drugs, mainly because a bunch of the invitees are underage, but that's besides the point. Then again, we completed the party by attempting a Lord of the Rings marathon, so there may have been a few too many healthy nerds present D:
In any case, do some thing that YOU want to do. If your friends think you're boring and leave, then, I'm sorry to put it this bluntly, you need better friends.
P.S: You get wayyy better friends at Uni. Something about loud nerds converging to talk about memes and GPUs and SSDs and argue intel vs AMD during comp lectures means you get friends *FAST* at Uni. I made more friends in a month at Uni than I did during my whole time in Primary and Secondary (High) School....