I am wondering what kinds of hobbies you have tried? You mentioned that you have never learned to play well with others. Have you tried photography? I find photography to be a wonderful hobby. You can do it all by yourself. You could start with an inexpensive point and shoot camera and if you find you really like it, you could eventually graduate to a DSLR. There are all kinds of things to photograph: nature, animals, people (even those you don't know, it's called street photography). How does this idea appeal to you?