Hi there bulletzone,
Seems to me like you've made the effort to get out there and talk to people, but have you ever asked yourself that it is your approach that is making you not develop friends?
Let me expand on this by offering some bulletpoints.
ConversationWhat do you talk about when you go up and talk to people?
Make sure to talk about YOU - not in a cocky way of course, but offering information about yourself, and asking for details about others will bring you to 'friendship' level. Too many times conversations end up being about schoolwork, the weather, or something trivial happening in school...
Talk about your interests, childhood experiences, funny times in school, what made you choose the uni you're going to.... ask them for the same.
Copy-catNoticed someone that has made friends quickly at your uni?
What do they do that you haven't? How do they speak/act around other people? Emulate that... and soon it will come naturally!
Not only going up to people, but walking alongside them...This is an important one. I know this may sound creepy, but honestly it's not as bad as you may think. Simply asking people, 'hey, where are you off to right now?' or 'I'm going to the cafe/library/park, mind if you join me?' instead of saying 'alright, got to go now. see ya!' works WONDERS. Take it from me. In this way you're having more conversation along the way, and actually you are sort of moving yourself away from the sort of aquaintance group that you may occupy. Spending more time with people is a big one that's glossed over one too many times!
Body languageDon't act standoffish. Just a tap on the shoulder, a smile, a highfive, a hand on the shoulder, a hug... Makes you seem more friendly and approachable and allows other people to open up themselves to you.
Personality? Crack jokes. Share your interests. Share something weird about yourself. Ask about the person you're talking to, too.
Conclusion: Remember, going up and talking to people is only half the battle, but HOW you're doing the conversing? That's how real friends are made. Soon, once you do this enough, this will come naturally.
Try gaging who you'd like to be friends with; talk to someone you haven't before !
Any more questions, please ask.