If you haven't tried it already, I would recommend cutting down on gaming. There's nothing wrong with gaming as a hobby, but, at least personally, I've found that gaming doesn't help me feel productive or self-confident. If you can, try to take a day or two off from gaming completely. Work on an old project, or (even better) start a new one. Go out for a walk or visit a new place nearby, read that book that's been on your shelf for months, or look over your notes and see what you should brush up on for next year. I've always found that doing those sorts of things makes me feel much better about myself than playing games, even if they aren't necessarily things that are productive.
Sorry, I didn't mean to suggest it was, although I realize my post probably came off that way. I just meant that, in general, I found it easier to feel productive and generally positive if I'm not gaming much (even if I'm not actually being productive in a traditional sense), so I suggested it might be worth trying to not game as much, but obviously I don't know whether or not that's something that would help you with the issues you've been facing.