I've been really down lately...

Lauren
I don't really know what to do anymore honestly....
I'm 17 and I have Major Depressive Disorder. A few months ago I stopped taking medication for it because it wasn't working too much. 
The past few weeks I've been feeling really down. Low energy, bad thoughts about myself, and I get so sad to the point where I can't stop crying and I feel so burdensome.
I just feel like ending it all so I don't have to burden anyone anymore, and everyone would be much happier without me. I wouldn't have to go to the hospital anymore for my depression, or see anymore expensive doctors that my mom can barely pay for. My friends would also be much better off without a friend whose always so sad and down, and my boyfriend wouldn't have to worry about me anymore. 
What should I do?