I don't understand why I only remember negative things from my life. I remember all the bad and uncomfortable things that happened. When I try I can come up with so many new things I haven't thought about in years, but not for positive things. I can't for the life of me bring up happy memories. I'm sure I must have had them, my whole existence can't have been so miserable. So why am I able to draw on so many negative memories so easy but not happy things I've experienced? Does this have to do with depression?