Why does your mental illness prevent you from losing weight?

Either way, it seems your mental illness is the first barrier. So don't focus on getting a girlfriend. Focus on learning to cope with your mental illness.

This isn't going to be easy, especially if you can't find a therapist, and I don't want to give the impression that I'm trivializing this issue. But I think you need to focus on this first, and take things one step at a time. Otherwise, you're going to get overwhelmed, and then just give up.