Famous Idiom from your country?

“If a crow-tit walks like a stork, it will tear its legs”
뱁새가 황새 걸음을 걸으면 가랑 이가 찢어진다

Baepsae/뱁새 is a Korean Crow-Tit but used to call someone who ruins themselves by trying to copy people who are better than them.