I haven't developed any hobbies either. Every time I go to my therapist she asks me if I've done anything or joined anything and I'm like no, I can't think of anything to do. Everything I enjoyed I don't enjoy anymore, or I don't have the drive or willpower to leave the apartment. I could look up classes or clubs, but when I do stuff like that I always feel so out of place. When I get really bad, sometimes I just go out and drive around, or walk around a store, like Walmart, or go sit in a cafe and have coffee by myself. I wish I could say something that would help, but I know how you feel not being able to get a hobby.