thing i hate about depression is the enduring sense of loneliness. perhaps, you send out depression vibes which drive others away. in addition, you feel that no one quite understands and you're all alone.
basketcase:
I know what you mean. I'm going through it right now, myself 
jade:
I think you may have something there. In my experience, the more upbeat I get, the more people seem to approach me. It sucks because if you are depressed it creates a terrible cycle.