Don't worry, lots of people go through this. I've had the exact same situation but it's starting to go, and talking to some second years last night quite a few agreed that freshers week is unnatural and weird feeling, and that they'd been homesick and lonely at times. It's normal and hopefully will pass as we get more used to life at uni.
Here's what I tell myself, almost all of this applies to you too:
We're confident and social people at home so we aren't realistically going to have any problems making friends somewhere like uni which is full of young people.
Our friends at home are amazing, but we've known them for years and so can't expect similar fantastic friendships to spring up in a few weeks at uni. People have told me and I've read that the instant bonds people seem to develop in Freshers often don't last, and that the best friendships are made in the second semester at the earliest.
We've only been there a week or two. Changing your life so much (the people you hang around, where you eat and sleep, where in the country you are) is always going to be unsettling, this is what makes us miss the comfort of home and all our friends, it's what makes us depressed and upset, which is normal and fine.
I'm sure things will pick up soon. There have been times when I've been intimidated/not liked the look of my course too, and I've indulged in the thought of dropping out and doing something else, but I think it's far too early to realistically consider a drastic action like that.