I KNOW I'm depressed, but now what do I do?

Ok, I KNOW I am depressed, and HAVE been for about 2 years now. I just mope around, sleep WAY too much, have been gaining weight, slowly but steadily, which is unusual for me, and just am SO depressed! I try to make lifestyle adjustments, and while they seem to help some, I always revert back to being down and helpless. I never used to be like this! So I know that if I made some changes in my life, like went to school, or did some voluteer work, etc, then maybe I could be happier and more fulfilled. But I can barely get out of bed some days, so what makes me think I can go to school? So I'm wondering, does depression like this warrant medication? I feel like its just an easy way out, like a copout, but at the moment, I'm not sure what else to do?!?!? What do you think? Do I just need to try harder to make my life better?