1. Be Social - Go out and find people who have similar interests to yours.
2. Be Open Minded - You will be suprised my the amount of people you share interests with. At first I would never have thought that people on my schools water polo and swim teams would be into the same things I were, but some of them turned out to be very intelligent people well versed in nerd topics, who just happened to also love water polo and swimming.
My high school experience has had ups (friends) and downs (freshman year), but as I enter my senior year I will be very sad to see it end.