Please talk to someone. Does your university have a counseling center? I understand that no one "gets it". I'm now a professor but I had depression back then and I am still fighting it. I wish I had found someone to talk to back then because I got so used to shutting it out that now I don't even know how to talk about it. Another thing, as hard as it may be, if you absolutely cannot continue with your classes and are doing poorly, it is better to WITHDRAW, so those grades don't haunt your record. As another responder said, it is only a little money (in the long run) and a semester, and you've got time. Take care of yourself first and foremost. You're in my thoughts.