I know where you're coming from. In Uni, outside your course (and for me, inside my course) you don't tend to associate with people as much as you would have done with your old friends. You've made bonds with them, and you have to start again here.
I came here with the intention of making new friends, but I've basically ended up with a pile of acquaintances. Sure, there are old school friends here (so, sorry OP, I'm not in exactly the same boat as you), but everyone else is either someone 'closely associated' with me, or someone I know by name/face/phone number.
I don't think it's your own fault really. Look on the bright side - you're bound to find someone you click with immediately.
[anecdote follows]
By that, I mean, there is someone who you will get on with - Uni is a big place. I have a mate from my Spanish class, and we met on Facebook before the term started, so we were ahead of people really; we end up doing most of the paired assessments together it seems. In other Unis, surprisingly, I've clicked with more people - I went to Exeter to visit a friend on Tuesday and I really got on well with her housemates; three in particular. I suppose it just goes to show that:
a) don't judge books by their cover - don't think "Oh, they want to go out all the time" or "Oh, they want to stay in all the time" or "Oh, they don't like the same band as me". Somewhere, once you start prying, there's someone really cool.
b) don't be afraid to just walk up to someone and talk to them on a night out. It's how my entire Freshers went - "Hi, are you a fresher?" and go from there. You might pick up another acquaintance - you might find your prospective best friend for the next four years.
Don't panic though. You're eight weeks in - it could be worse - you could have been four years in and thought this was a problem.