This sounds cliché, but I understand how you feel right now. I've been through it, and I'm sure I'll be through again, because that's how our brains work when we get depressed.
But worry not, since tomorrow will be a better day. Aim for improving yourself and try to fix what makes you feel unhappy, since that's the only way out of this rabbit hole.
(sorry my words are not as inspiring as I'd like them to be, but they're honest - I hope they make u feel better)