Hope your okay. You have experienced a lot of changes in a few days, it is normal to feel anxious at first. My advice would be, if you really feel the same way in , lets say..2 weeks time, then talk to your tutors, SU, and explain how you are feeling. Loneliness is one of the hardest things in life to deal with. Im sure people do not dislike you. You will make friends, it may just take a bit longer. Not everyone hangs around in groups all of the time, I myself particularly wouldn't like to hang around in a group..and maybe they're hanging around in a group to feel safer themselves. The group thing will soon disperse. But anyway..I will have all this to go through myself as I start Uni on Monday. Hope you feel better soon, but if not..speak to other people.