If someone could help...?

I am 25 years old, educated college graduate, great career, new car, new apartment, loving family....and severly depressed. I do not want to live anymore. I have been depressed and suicidal for the last 10 years or so, but have never attempted suicide...guess I'm too scared of the unknown. I've tried medications, talking to people, exercising, just about everything. I pray and read my Bible often and thats the only thing that keeps me going...I just dont know how much more I can handle. I'm unhappy on a daily basis. I have severe mood swings, and some of my friends dont want to deal with me anymore because I'm getting on their nerves with my attitudes. If it wasn't for the shame I would cause my family I probably would have committed suicide a long time ago. I just dont want to put my family through that pain. I feel I'm better off without this world..and I wanna let myself out!!