It's strange. So, here's the "humble-brag" part - over the course of my life, since I was 16, I've been a freelance journalist with a large readership, published in multiple countries (and even translated into Portuguese for the Brazilian audience). I've won some very minor awards (not even on the same league as the Razzies). I work on the frickin' Xbox for gawd's sake (which carries a certain built-in nerd-cred with it). I'm one of the most famous programmers for a specific computer. I've made a couple of short films. I've made games. I've made all kinds of stuff. I'm not a household name, but I'm a "known quantity".
I tell you this not because I want applause and accolades, but because I need to set up my credentials so that I can contrast them with what comes next.
I'm hit with Impostor Syndrome all the freakin' time. All the time. Every single day.
For what it's worth, I also have trouble with being complimented - compliments bounce off me... I fundamentally have trouble believing them at all, and I can't take them to heart - no matter how sincere they are. (I'm told, and I suspect, that in many ways this is a very British trait - others may feel the same way, but we owned it and made it ours. Like irony). If you really want to make me feel good? Tell me something I did is cool - I can relate to that.
So far as I can tell, my own personal internal ego dial is always set somewhere in the direction of "mildly unworthy".