Imposter Syndrome!

 The latest in the armchair psychology craze, this term describes the condition whereby successful people - that is, people already doing the job, worry they may not actually have what it takes.  The nagging feeling that someone, at any moment, will gently tap them on the shoulder and say, "You've been found out.  I'm afraid it's time for you to go."

What's the term for when you don't get the job to begin with?

Anyway, based on the number of successful people who suffer from this fear, I bet that tap on the shoulder must be one of the worst things anyone could experience.