Hey man, I know it's tough making new friends when everyone seems like they already have their group. Make friends in classes, form study groups. Connect with 1 person and give them your number.
My next question is, what do you like to do? Obviously you want to party. What sports are you good at? Basketball? Volleyball? Football? Go to the rec and jump into a pick up game, go to the playfields on Valley behind the rec and find a group playing. Walk group to group and see if they need 1 more... (I usually look for the group with odd numbers, seems to work out better) :D
My main tactic in making friends is to just smile a lot. If you make eye contact with someone and they smile/nod/positive response back... just go say hi. Good luck man, stay positive. Its hard to not be friends with positive people.
P.S. This is the guy who walks around campus who is always moving his hands (Gloving). If you see me, come grab my shoulder and say hi, I can 99% of the time stop for a few minutes and BS with a new friend :D