great point Hsiang-Lin, i forgot to add that in my original post
When I first started making friends, I had a rule that if someone asked me to do something socially with them, that I had to do it unless I had something realllly important on. Even if someone who I didn't really like, asked me to do something that I thought would really suck, I still did it. This makes you more open to making friends, because you can't turn down their invitations. As I made more friends I relaxed these rules, because I had enough social outlets that I could pick and choose wat i did. So yeah... even if u meet someone you don't particularly like, and they invite you to go clubbing or wateva, i'd suggest doing it. I mean, at worst it'll be a learning experience for you, but at best you'll meet a ton of fun and exciting people.
Best of luck