One word: Alcohol, for a variety of reasons:

1) Chicks your age dig guys who can get alcohol
2) It'll loosen things up among your seemingly uptight friends
3) Youll like the feeling that drunkenness gives you, making you much funnier and smooth around the girl
4) You may realize that you like being drunk over high anyways, smoking truthfully isn't for everyone
5) Easy vagina; You'll forget about the mj-hating bitch within weeks, you'll meet a nice chick who likes to toke, and you'll fall in love

I take no responsibility if you turn up on alcohol.com's forums in a few years with a similar thread.