Been feeling really depressed lately, what do you guys do to cheer up?

Lately, I've been feeling really weird. Like everything seems gloomy to me. I don't feel like doing anything. It's tough to explain. A bit like Stan, from that south park episode where everything is like shit.

All my friends ignore me, or tell me they can't hangout and then update facebook statuses saying "today was so awesome...", etc. My family is consistently fighting. I'm just trying to last another year so i can go away for college and start over.

What are somethings you do when you're feeling sad?