Earlier quoted context omitted.
I can relate to most of the things you've said for me, my imposter syndrome comes mainly when I look around and see everyone working hard and struggling to do stuff well and I feel like I'm not even in 2nd gear and doing as well. So I think I feel like I'm only putting in less then 25% effort and getting 100% of the normal results (relative to others) - it feels wrong, it's like finishing a test or exam too soon and…
I am going to use this for my humble brag training next week.
I really do think I have ADHD and I do become obsessive about things,
my job is my hobby, so I probably put more time in to things than what i realise,
but I still do feel like an imposter occasionally (less so with getting older)