I think that people without psychiatric problems have an easier time dealing with rote although even they burn out. Add some anxiety and you have a lot of trouble. This is because nervousness can lead to a flight or fight situation.
I know this because sometimes I feel like running from my job but I never do.
It is usually not a good idea to quit a job before you have a new one. Maybe some people here who have problems with work should try and talk it out with their therapist before they quit. I think it helps.

I don't think I will ever be able to manage my anxiety perfectly, as I have generalized anxiety disorder, but I have managed to keep a job for quite a while now. Talking to my therapist doesn't stop it but somehow I manage to tolerate it. Keep in mind that having a job is essential to mental health and survival.

I also think that many people with mental disorders (though not all) are creative types, and creative work is not easy to get paid for, so they have to try and fit in somewhere in the world to pay the bills. This can be rather intolerable for anyone, especially a person with a disorder, so don't beat yourself up too bad. We live in a world that doesn't want us to have too much freedom because the business world is based on efficiency. It is what it is and your probably not going to change it.

That said, keep pushing, talk it out and maybe you will make it where you want to be.