How can I stop myself feeling deressed?

get a job and earn money. making money makes you happy.
earn big credits, buy good stuffs will cheer you up.
star wars jedi knight jedi academy pc game is a good one.
star wars the old republic online is also a good one too.

well..your not telling us how are you so overly depressed in your life so I guess all i can say is

be happy no depression

Do an activity that will get you away from everything and can occupy your thoughts. For example, you could do an art project, go to church, hang out with a couple of friends, go get lost in a big apartment complex and find your way out, smoke some weed(if you're not against it), build something, play Pokemon. There are numerous things to do just get up, get out, and do something.