YOU SAID:

hetalia was the biggest mistake i ever made

INTO JAPANESE

ヘタリアは私が今までで最大の間違いだった

BACK INTO ENGLISH

Hetalia was my biggest mistake ever

INTO JAPANESE

ヘタリアは私にとって最大の過ちでした

BACK INTO ENGLISH

Hetalia was the biggest mistake for me

INTO JAPANESE

ヘタリアは私にとって最大の過ちでした

BACK INTO ENGLISH

Hetalia was the biggest mistake for me