I am sorry you are going through this. It's actually very common. My DCs decided not to go to university because they didn't know what course to do. They are doing other courses in the meantime.
Of their friends who went to university I can't tell you how many dropped out in the first semester. It's the best kept secret in universities. Trust me not everyone is having a ball.
Hopefully the accommodation office can sort things for you. Your room mate sounds absolutely awful. I would also advise you to chat to the SU welfare officers who can be great. They can suggest clubs or societies or voluntary opportunities that you might like.
Try not to worry about second year now. You can probably rent a room in a shared house off campus next year. So long as you enjoy your course stick with it. Easter is very early this year so it won't be long before you have another break.
If you absolutely hate your course have a chat with your course director. This might not be the course for you. University will always be there and you can go back. Some courses are starting to be delivered online only and this might suit you better. Search for virtual campuses.
Remember not everyone has to go to university. The civil service and other organisations run apprentice schemes and the feedback is great and if this interests you, you should check them out.
You might find an Erasmus course that interests you and you could maybe spend some time in a different country and make friends too.
I hope I've been of help. Not everyone loves being away from home and lots of people are home birds at heart. If you feel lonely, worried, anxious etc go and see Student Support or have a chat with your doctor.
Big gangs at university can look like they are enjoying themselves but it is often not the case. They can sometimes just cling together because they are frightened of being seen to be a 'loner' with no friends. Often trying to fit into a group can be a very lonely experience.
I hope things improve, let us know how you get on. 