Whenever I feel like that, I volunteer at a homeless shelter, soup kitchen, crisis help-line or something like that.
You wouldn't believe how seeing what others have to go through will do to make you feel lucky and blessed.
Some of these people have been kicked down, dragged through and slapped harder by that cruel bitch FATE worse than I could imagine. I feel lucky to compare myself to those folks, AND I get to help them with their problems, even if that is as small as saying, "Man, that fucking sucks..."
Get out and get involved.