I can't relate with these at all. I realize that most people have an internal measure of "worth", but why? I don't assess myself, in interviews I detail facts about what I've achieved and let others do the assessment themselves. What good does it do to say (or even just feel) that I'm not good enough for a job that someone thinks I'm great for?

I just do my best and hope that's enough. If not, they can always fire me. Why worry about it?