I really dislike my study abroad and it's making me miserable

I've been studying abroad in Finland for 6 weeks now and I feel my metal health deteriorating badly and I'm not sure what to do. I'd always wanted to study abroad and have done summer courses before and really enjoyed them but it's just nothing like I expected.

I just feel incredibly lonely and I struggle making friends and so apart from the one girl I came to finland with, I have no friends. Most of the exchange students at this uni are German so they just group together and many seemed to know each other before coming. I know its a cliche but it feels like all any of the exchange students do is want to go out and party which I have no interest in. Whenever I go to an event and talk with the local Finnish students they are all really friendly but no one actually talks to you outside of that. I find myself spending most evenings just doing nothing. I've looked into societies but there's not really anything that interests me either.

The work is also not what I expected. Many of the courses in english are masters courses but I'm only in my 3rd year of my bachelors degree and so they expect us to know a lot more than I do. We have raised this problem as there was a general miscommunication between my host uni and home uni but there's not much I can do now.

I've always struggled with depression and I feel it worsening a lot. I've also had problems with eating which has also been happening again. I've lost my appetite and have absolutely no motivation to do anything including cook a proper meal. The amount of work I have to do in the next couple of weeks and go to labs every day to do things I don't understand just feels like an impossible task and just want to stay in bed all day. Everyone says I should just try a bit more and if it really sucks just go home at Christmas (I'm meant to be there until May) which I suppose is sensible I'm just worried I'm going to absolutely crumble in the next few weeks. I don't want to give up and regret it later on but I also don't want to force myself to spiral further. I'm just wishing I never chose to do this program and continued with my degree as normal.

I guess I just want some advice because my judgement is so immensely clouded.