Hm I love pc gaming too, but it doesn't help you feel less pathetic or depress. Or it will actually, but temporary in my experience.
Sounds like a good idea to start biking, go to the gym or do sports. You can always buy a new pc when you're feeling great again, the games aren't going anywhere.
Oh and if you have people you care about and they care about you, they won't mind listening to your troubles and will even help you out with them. Talking is nice.
Anyway so much for the random stranger's advice in a pc topic on a manga forum, if you can even call it that, haha.
Oh and Zotac seems to get pretty good reviews but I am unfamiliar with the brand myself.