That feeling that I don't deserve my job title, that I don't deserve the salary I want, that I somehow lucked out and I'm never going to find another job that's going to value me and pay me more than what I was getting. It's called Impostor Syndrome and I've felt this way most of my adult life. This article at Pacific Standard nails it: Not Qualified for Your Job? Wait, You Probably Are
Now having a name for that feeling is great- I'm not alone- but now, we go through the process of disproving the feelings by documenting proof.