Hi, I'm the king
I'M SO SORRY FOR EXISTING!
Wow, a carriage...?
I'M SO SORRY!
Oh, nice work, dude...
I'M SO SORRY FOR MAKING THIS!
....
I am done with this stupid, idiotic, moronic, incompetent, boorish, sniveling, bathetic, groveling bullshit.
If you're that useless of a human please end yourself so the rest of the world can exist without your screams and shrieks of self-loathing.
Just die, Mr MC; that way, you no longer have to apologize for existing, and never have to worry if you're allowed to help people, nor be confused if youre allowed to accept fair payment for work.
It answers all of your concerns, MC; it's the only answer available, according to your outlook... unless every single interaction is you lying to every person you meet; in which case, the remedy corrects your tendency to lie and dehumanize others.
Either way, this trope is trash; unrealistic, lazy trash.
Severe childhood trauma can cause this, but if every japa ese person ever isekai'd has this condition, then it isn't "trauma;" if they all have it, it's just the norm...
But, since they DON'T have this behavior, almost at all... it's not even a trope; it's just lies and lazy writing.