Sorry to hear you have had such a horrible start. It possibly wont help, but know lots of people have been there and did settle in (including me) and right now lots of other people will be struggling too, just like you
I did find that things got better once my course started, got to mix with a few different folks and had a few different things to talk about.
Joining some clubs helped too but it took a little time to find people I got on with (fwiw I ended up helping out with Hockey, getting kit ready, packing it away etc and found that much easier to get to know people that way rather than just training / playing, where chat was less easy anyhow)
If you need something outside of Uni, a friend of mine actually joined a club in the local town with a wider mix of people / ages and that suited them really well. Another worked in a charity shop in town, others got jobs in coffee shops etc and made friends that way