About relationships: If you really feel you would only be a burden to the other party (I suggest that this is not accurate, but recognise that a feeling can be its own reality), how about compensating the other party with money? Unless you live in a very small town, something of the sort should be available. I suggest this only as a first step; it is amazing how much better you can feel after getting laid. (This advice applies if you are male; if female, getting laid should involve more filtering out creeps and less searching for willing partners.) Other possibilities are nonsexual massage and lap dances; humans are not designed to be alone, and physical touch is a major component of how we interact. It does not really matter how you get to the point of intimacy; your primate brain will believe you gained status in the tribe, and feel much better about life.

Again, this is to be considered a first step, a sort of shot in the arm of serotonins and whatnot to break a vicious circle. Get laid, then consider your options; I predict with high confidence that they will look much better.