Lol freshmen. Basically, just be yourself. In high school, that's where people (who are mature enough) usually sort out into the group of others they're comfortable with. For example, I'm a sophomore, and I'm finally starting to find other kids like me. Gamers, you know? I had a long discussion with a junior named Nick this morning in German 2 about upcoming titles like Deus Ex: Human Revolution and Mass Effect: 3.
Like I said, just be yourself.