A couple of interesting choices here! 10cc's I'm Not In Love? Read between the lines - he clearly IS in love, but just doesn't want to admit it. One of those "men having trouble showing emotion" songs. It never pays to take 10cc lyrics at face value! :-)
I don't find R.E.M's Everybody Hurts depressing at all, quite the opposite in fact. I think the sentiment of the lyrics is very touching, and meant to be comforting in sad times. Still, each to their own.
Personally, anything by Westlife, Gareth Gates or Geri Halliwell depresses the bejabers out of me.