I'm having a lousy day, so I'll drag out the old compliment meme:
One little compliment can make you feel amazing.
So...give me a compliment, anything in the entire world, even that my shoelaces are pretty. Then copy this and put it in your journal. And once you get some comments, put that entry in a memory or tag, and when you are feeling down, just go to that entry and this will remind how great you are.