((((((Gooogley)))))))) Take a deep breath, and step back. Look what you are doing.
You are under stress, right? Right. Tough stuff stress. Needs tough measures. But what's happening? You are calling your self names and taking the fact that your classes don't allow for reasonable working hours as proof of your worthlessness. Logical? NO. I don't see how it follows. That is not you speaking, that is underlying tendency to approach disappointment and stress and frustration according to Depression's rules, and not the rules of logic or actually solving the problem.

Googley, you are a winner. The only people (or thing in D.'s case) who would say that you are not are liars. They have a hidden agenda and your best is not what they are after. You are obligated to do what you can, not measure up to some expectation of liviing that illness and other things make unreachable RIGHT NOW. You are studying, you are fighting a nasty chronic mood disorder, you are trying to sort yourself out at the same time you come here and reach out to the rest of us who have problems.
MR. D simply kicks the feet out from under people and lies to them when they are down. Is that a winner? NO! I know, when I start to mess something up, I start cussing at myself, and that is a powerfull urge that is hard to break. BUT I have been working on it, and it happens every couple of months now, not every day. Keep fighting it dear. Someday you'll be clear of this and on your own feet, but accept that it won't all happen now at the same time. Huggggs. Many and warm.