I'll never be able to hold down a job.This is the kind of anxiety that you might have (and I think I did) when you are 16 (going on 17), or maybe a bit later when you are about to graduate. At that point it might be unnecessary to torture yourself about this, but it's an understandable worry.
I am 50 (going on 51), and I've had my current job for 15 years (going on 16), and had miscellaneous other jobs before that.
My anxiety was not that I would lose my job and not be able to get another one.
My anxiety was literally that I would never in my life be able to hold down a job, even though I have actually done so for more than 20 years.
Anxiety can be pretty ridiculous!