I'm at university too, and all I can say is "springboard socialisation"
i.e. find someone on your floor who is a bit social. Try and make friends with them, even if you think they're a tosser. You'll find yourself finding other friends through them. Hell, I've made a few friends through a guy on my floor who is a bit of a "player", and I've just met the people he's met.
Also, remember that expectations will be high, and you need to lower them. I didn't make friends at first, and I'm only just starting to meet the people who I can actually see myself making friends with.
Don't just join things like the politics society. Be spontaneous. I took a chance with the archery society, and it's quite cool.
It's bloody hard to find proper friends, but it's not impossible. You do miss hom at first. I missed home briefly, and after 2 weeks, I went back for the weekend, to see how much of a mess home was without me. My dad hadn't done the shopping in two weeks, and there was hardly any food in the house, and it felt kinda strange, since home to me is a campus, and my local pub is no longer a pub where old people sing crap karaoke, but one infested with students.
In between it all, you've got to try and let your family go. I know my dad hasn't let me go - I was chatting to him online, and he was very interested to keep saying to me that I need to make sure I actually work. (I've already figured it out for myself - I've seen some of the challenges that my course presents already, and I'm getting ready to take a chainsaw to the proverbial ice block.) And he was quite interested in my social life. But that's only really starting to take off.
The people on your floor or your corridoor are the first people to talk to. There's 6 of us on my floor, all sharing a kitchen, and I find that I can chat to them about stuff, and maybe go out with them, or failing that, I have a bottle of the most hardcore (cheapest, crappest, dodgiest) whiskey that I could find in sainsburys, if I ever feel like having a night alone.
In short, finding people you get on with is a bit hard. Hell, I have a floor full of nice guys. Absoltely cool people, but not my sort of friends. But if you don't get on with the people on our floor, there are alternatives. One of the friends I've made in the past few days is someone who doesn't like the people she lives with.