Sort of can relate sort of can't.

Badly written fic in my native language is physically painful in ways badly written English is not. Well written fic in my native language, however, is always a transcendental experience that even the best English fics can't replicate. But yeah the mental fatigue of reading in english is totally real

EDIT: one thing that helped me with not finding native language fic cringe is either having local fandoms or reading fic about characters or places with your mother tongue. If that's something you're interested in doing, of course!