Can totally relate to this! Am a systems admin (networks) in highly competitive environment - and stopped putting myself out there into the unknown/new systems and very adverse to change because I just felt too stupid and inadequate to go for it. I don’t know when that started...because I certainly didn’t get to where I am by being that way.
It is years and years of being made to feel inadequate, stupid etcetera...
I am much much better about this now but still have a long way to go as my first reaction is to assume that things were my mistake, I didn’t do something correctly and the whole nine yards. I agree self talk is huge - I am enough, I am intelligent, I am able...