YOU SAID:
don't let anyone tell you your ugly, you are, but don't let them tell you
INTO JAPANESE
誰にもあなたの醜さを言わせてはいけない
BACK INTO ENGLISH
don't let anyone tell you how ugly you are
INTO JAPANESE
あなたがどれだけ醜いか誰にも言わせないで
BACK INTO ENGLISH
don't let anyone tell you how ugly you are
That didn't even make that much sense in English.