Now, we finally know the reason for why our MC think that he's a weakling. He thought that Adventurers especially C or higher will at least as strong as the Orichalcum Fist when using heavy handicap, no wonder he always think negatively...
This is almost the same as Tatoe Last Dungeon where the MC think that he's the weakest since other villagers have absurdly inhuman stories but it turns out that indeed he is the weakest but ONLY in his village but not outside his village. The difference are the MC in Tatoe Last Dungeon is a young guy and way more positive than our MC here. Also remember, he always seat in back office so he doesn't know about other Adventurer's strength, he use Orichalcum Fist as the comparison so cut him some slack. But welp, hope that he become more positive thinking few chapters later