Idk why people talking about rei like he's being unreasonable, societal pressure is a bitch and no matter how that perfect image of him was formed, he feels pressured to keep it up and not let people down. He also has no reassurance that anyone other than his family would like his actual personality since he doesn't drop the mask unless he's at home. Who knows how long he's been keeping it up, and who knows what caused him to try and improve his image in the first place, expectations will always be there and that'll always suck.