A Question For The Ladies: Why Do We Build Up The Confidence Of Young Girls Then Destroy It When They Get Older?

A while ago I was watching the show What Would You Do? and I saw an episode about a young girl whose father was making her go get Botox. The whole point of the show was to see if anyone would speak up and to no one's surprise, many did. I found it interesting that we tell young girls that they're beautiful and that they shouldn't change a thing, yet suddenly that all changes when they grow up. Women continuously tell each other that they could use a lift or a nip tuck here and there. But what happened to that beautiful young girl who was once perfect the way she was? On What Would You Do? this young girl that was "getting Botox" was showered with compliments about her natural beauty and people were outraged when they thought she would ever go through with it but if the situation was reversed and the woman was 21 years old would our response be the same? Don't get me wrong, I'm not saying we should encourage young girls to get plastic surgery or want to change their appearance. I just find it wrong that we try and build up the confidence of teenage girls so that they do not grow up to be insecure yet once they do get older its all of a sudden okay to judge their appearances.Why do we teach our girls to embrace themselves but later teach women to change themselves?