I feel worthless because I am not accomplishing anything
That is actually a very good point. I'm not sure if it is part of being male or just being human, but a sense of accomplishment in each day is a core psychological need. Most people toil their lives away at a job, so the problem never presents itself. This must be why rich people have hobbies.
When I was married, my wife's parents paid our bills. I still worked at a challenging but fun job, while she sat at home and waited for her green card. During that time, she fell into a deep depression. I was worn out from my job and commute, but overall much happier than her. We lived in a beautiful gated community and she had all of her needs met, but lacked a sense of accomplishment each day, which does lead to depression.
So that is the other extreme from working yourself do death - suffering from a lack of accomplishment in each day. But once again that's why rich people have hobbies. To call myself rich is ridiculous in that right now I have $8 in my wallet, but yet I am wealthy in at least lifestyle. Training in mma and actually working on occasion both fill my need to actually do something each day. But you raise a very good point that I am only just now learning in life. Everyone needs a reason to get out of bed in the morning.