Your difficulties sound familiar to me though I have never had them as bad. If I had what you describe, I would feel they were basically symptoms of anxiety.

Do you do any reading for pleasure? If you have had years of isolation, I would not jump into a heavy-duty social and intellectual pursuit like college right away. I would spend more time being around people and adjusting to just that and pursuing interests rather than someone else's dictates required to get a degree. Even being good at something; if you are not enjoying pursuing/studying it, it can be very hard. Find people you enjoy being with, study interests you enjoy studying and then try the other is what I'd do.