Heya :-)
I was in exactly the same position as you for the first half of my year.
It was only after a horrible breakup that I realised how bad it had gotten (and I'm now ecstatic it ended at least when it did, I wish I'd never been with him now)
aha, but anyway. I struggled at first, but luckily still being in halls I had the chance to hang out at dinner and I pretty quickly managed to save myself, and ended up with amazing friends
I too however have neglected coursemates though as well, and am worried about that for next year.
I wouldn't recommend coursemates anyway because I didn't find a group of them forming easily at all anyway, but again no harm in trying.
I can't pretend it isn't harder being second year to start again - people will already have friends. But then again, a lot of people at uni are very friendly.
You need to keep in mind most of these people have only really known each other a few months. Most housing groups change - thus friends change.
Where are you living? Maybe there's opportunity there?
You say you don't have any interests - you must have at least something. My uni has soo many clubs that I guarantee you'd find something. Or take up a new hobby! (pole dance for instance?)
Also, anyone you are even only friendly with a little - become a tag along. When alcohol's involved then it all only becomes easier. (I went to dinner with the girl who lived opposite me, and it all really started from there)
Uhm, I can't think of anything else atm but I'm sure there is hope! I did it in a couple of months after this winter, your timing may be a little later but it's uni after all