Re: What am I doing? I don't know.
I've been there- 100%. Just completely unmotivated, no direction, going out to run an errand in those days use to make me tired just because it seemed like a super busy day... like going to pay a parking ticket would be this ridiculous task.
I agree with the exercise, definitely. Also look into reading for pleasure, or even self help books. Gives you an excuse to visit the library, etc. See if you can work a few more hours. Give community college a shot... get the basics out of the way... and only take 1 or 2 classes at a time so you can concentrate on gaining routine.
I learned one thing in all my time of lethargy, depression and pity... I spent way more energy being upset about it than actually doing something to fix it. Take some time to look at your life and what you want to change. If you don't like something, go back the old fashioned way and make a goal and steps to reach that goal and get to it. You don't have to have all the answers now.. you don't have to know what you want to do... some people are in there 40s and 50s and still don't know, but I think the point is you put yourself out there to experience life and make mistakes and grow... even if it's you realize "this is NOT for me", I think it's better than "I have no idea what I want."
I hope it gets better and don't completely rule out getting help from a therapist... sometimes it's just the most efficient thing to do and there is nothing wrong with asking for help.