Now im alone and feel kinda alone in this huge campus (i dont know anyone really cool to hang out with)..
I'm gonna goto the gym, but I used to be friends with EVERYONE in high school and now in college everyone is finding their own little group, and im not in any of them =(
I suggest you start getting involved with clubs on campus. Thats the easiest way to make friends and meet new people.
It's hard from going from (And yes, this is so cliched) the big fish in the little pond, to a little fish in the big pond. You'll find your niche and soon enough have plenty of friends.