You mentioned that you have tried hobbies. What have you tried? What about photography? If you don't "play well with others," it's an ideal hobby. I am an introvert and I don't enjoy team/group type activities. For me photography is very satisfying and something I can enjoy all by myself. If you just have a point and shoot camera to begin with, that's okay. Start there and if you find you really love it, you can graduate to a DSLR.
You can shoot nature, animals, people, (even those you don't know, it's called street photography) or anything that interests you. What do you think?