I think getting this job is the worst thing I have ever done
Do you feel that it's too demanding?
Yes, I have  physical job and a lot of unpleasant things happen there.
I understand your frustration. I'd advise you to find some other suitable job that's less demanding.
This is the last resort for me. I'm stuck here.
You should never feel like you're stuck in a job. You can always change jobs for a better one if need be.