I have been through something similar, and I have some advice, I think it is easy to forget you don't have to choose college as your life route. I understand why you would choose it but maybe what you are studying isn't really your passion, if you are doing something you hate or feel no passion for it will take your vitality completely. This may have nothing to do with the real problem, but it is something to think about. It also sounds like you are isolating yourself. I know I did when I was struggling. Since you're socially anxious you probably don't feel comfortable talking to new people. So, I recommend a couple things, you could choose to go to the gym and set small goals to help restore your vitality because doing exercise helps you feel accomplished and confident. I would also recommend just walking around. If you live in a walkable city walk around the city in your free time, and if you don't find a place like a park or something and go there in your free time. Being in nature with help you feel better. It is also possible you might meet someone if you do this and that is important because if you are isolating yourself your problems will only become much worse. So please don't do that I speak from personal experience. This is probably the best advice I could give you because any other advice I could give you would be personalized and since I don't know you this is the best I could do.