Yeah, J'Onn feels like an outsider and "alien" (in the non-extraterrrestrial sense) in a way that's very relatable to real-world minorities. In many ways he CAN'T fit in. He can try, but it can only go so far. Doing Human things for Human reasons just doesn't mean the same thing to him. It's more of a cultural outsider thing than physical, but still a powerful analogy.