You have to be willing to put yourself out there for people to get to know you, be talkative and open but don't over-do it or you'll seem desperate. Just be yourself and say "hi" to total strangers on campus.
I remember collage and university; I had to really open up to get people to talk to me and in doing so I found a side of myself I really liked. Just by doing this simple thing I've also noticed I can get jobs easier, also, as PR is really important. It's done me a world of good and I think it'll help you too.
Maybe it's just you? I mean, I was once like that, a lone wolf, too introverted, I only knew school and home, these two things. It bothered me actually because I felt lonely too, but soon it all became better, I changed, I also changed school But I think that college is quite lonely, because people mind their own business, simply work, and others party a lot of course, depends in which category you are. And some have more things in common, get along better. I don't know about your girlfriend, maybe she is dealing with some kind of problem at this moment? maybe she needs space? or try to get through to her, talk to her, ask her if something is wrong, explain why you behave this way, if you think your behavior is what is bothering her. Communication is the key my friend..
Well honestly I thought Highschool is the worst time i have been pass trough. I really don't know why those people react like that to you, why don't you stand up and ask them why they treat you like that? Most of college kids should be wise and not picky, I feel that over here.
and don't worry, you are what you are. My friend always told me: "You are what you are they are what they are." It means don't ever blame or ashamed of yourself if people treat you of silly reason.
Here are some ways I made friends when I first went to college, maybe they’ll help you as well. ^_^
1- Talk to people in your class. You'd never know it, but the person sitting next to you could have a ton in common with you. My first week of school I saw someone doodling before class started and I went over and sat by her and started talking, three years later she's one of my best friends. Talk to someone, ask if they wanna grab lunch after class! Making friends in class is also a plus because then you've got a study buddy!
2- Hang out in common areas. I'd always chill out in either the TV lounge or the cafeteria when I was drawing, doing homework, eating, or reading--either someone you know will come into the room, either from your floor, your class, or someone you met at orientation, or someone new will come in! Don't be afraid to talk to people, and if you see a familiar face, don't be afraid to go over and say hi!
3- Friends of friends are potential friends for you. Many times I'd sit down to grab a quick lunch with someone from class and people who knew them would join the table--and it would be awesome! We'd get into conversations that would last hours and more and more people would join the table, it was a blast. Some of my best friends were made this way.
4- Every event is an opportunity. Make sure you know what's going on campus. An art gallery opening, open concert, anything presents a chance to meet new people. Also, free food is nice.