How can someone stay positive when everything goes wrong?

I've always had a less than easy life. Parents divorced, my family abandoned me, I was surrounded by abusive people, forced to move a lot, religious cult cause they were the only ones who loved me, cheating boyfriends, a serious health problem in my 20s that got me fired because I always had to go to the doctor, an ulcer infection that almost killed me because I didn't have insurance, and now money issues that never end. Through all of this I've done all I can to keep my head up. Most people would be floored to know I have any trouble at all because I've tried so hard to be better and not bitter. I just don't think I can fight the discouragement I feel anymore. It seems like there isn't a compionate, merciful person on earth. People have never been interested in helping me as much as they are in making things worse. What would you do?