Nice guy is just a general term. As with most things, the definition varies based on the individual. I'm the nice guy in the corner watching others have fun. I will talk to people I know long before talking to someone I just met. I've always been that way. You put me in a situation where it's less than ten people and a few of them I've known for a while and I'll talk to everyone. In a situation that's a lot more than that, and I don't talk to anyone. I just kind of sit there and listen to the music, get something to drink (non alcoholic), and watch everyone else. What's funny, is on the net I'm a completely different person. I think it's because there's always a certain amount of anonymity.

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"BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Will he offer me his mouth? BOY: Yes. GIRL: Will he offer me his teeth? BOY: Yes. GIRL: Will he offer me his jaws? BOY: Yes. GIRL: Will he offer me his hunger? BOY: Yes. GIRL: Again, will he offer me his hunger? BOY: Yes! GIRL: Yes. BOY: On a hot summer night, would you offer your throat to the wolf with the red roses? GIRL: Yes. BOY: I bet you say that to all the boys!" -Meatloaf