Stories like this are really kinda boring. Like, I don't mind OP guy doesn't realize he's quite so OP, but the issue is they write them as COMPLETE DUMBASS who couldn't tell his left foot from right. Doesn't know his value, doesn't know his strengths, doesn't know how much things are worth, doesn't know the real world value of things, doesn't know how strong he is. Like, it's unrealistically stupid to live for years without even thinking and anyone noticing anything. Not to mention the girl, as usual, not explaining anything to him (though even if she did, he'd, in typical trope fashion just say "you're just being nice" - oh wait he did).
Sigh.