I've always found it difficult to make friends and was bullied throughout pretty much all of my school years. When I got to university I told myself that things would change and I'd be happy. Needless to say, things didn't change, I didn't make a single friend in 3 years. I wandered campus by myself and drank myself silly every night in my room. I tried societies/sitting next to people/etc but never got anywhere. I was so lonely and considered suicide many times (I did actually try once). Don't end up like me. I would really advise the societies even if you plan on dropping out, you might click with someone. However, and this is what I kept telling myself, you're there for a degree, you might be able to get a 1st if you put the work in (I got a 2:2 but there we go): making friends is secondary. Don't let a lack of friends force you to drop out. I feel really bad for you, mate, I know how lonely you feel but keep trying. Are you living in halls? Are you getting any help for the SA and depression? Have you thought of visiting the university counselling service?