A lot of people feel down and homesick at the end of freshers / start of classes... it's quite normal and you'll probably find it goes away after a while. Also, I'd point out that not having a lot of friends on your course isn't really that big a deal. I have loads of friends at Uni, but only a few (5 or 6) are on my course. Even then, I rarely sit with them in class, I just kinda wander in (usually a bit late) and plonk myself down wherever. When you're in class you'll be working (or at least sitting in lectures pretending to listen), not socialising! So even if you don't make any friends in your classes, it doesn't really matter so long as you have other friends to hang around with out of class. I also think you'll find that a lot of people aren't sitting with people they know.
As for your new friends not being people you can have deep & meaningfuls with - obviously that takes time. On top of that, some of my now best friends at Uni I didn't even talk to until 6 months or so into the year.