Hi Bear- I live this too, damned if I do and damned if I don't it seems every day lately. I thought I was the only one feeling like an imposture. I am relieved on this board how real my feelings are, that I'm not making this all up.... As my m would try to make me think. The paralyzation of thought and what actually is overwhelming and I get speechless.
I live this regret over not becoming a successful doctor as well.....I have to dumb myself down at my job to hide my underachievement and actual intelligence. I'm much smarter than I ever thought....... and even though this should be a positive thing I just boil over believing what my mother convinced me.... That I'm stupid. I could go on and on about what that looked like but I won't.
You are not alone Bear, those moments you are battling the NM in your head are very common for me. I'm just now realizing these battles for me are not actually totally founded in reality. We are not bad, and the battle will end with us on top with the truth.... The N will not know this, but they do not define what is so in the real world.
Apologies if I was rambling on, hope this makes sense.