Ok,yes it's a mistake,i know it's a mistake ! But there are certain things in life where you know it's a mistake. But you don't really know it's a mistake. Because the only way to really know it's a mistake is to make the mistake and look back and say "Yep, that's was a mistake!" So really , the bigger mistake would be to not make the mistake. Then you'd go your whole life not knowing if something is a mistake or not.