AvatarBrian LawsonHow Puberty Kills Girls’ Confidenceverified_publisherThe Atlantic - By Claire Shipman, Katty Kay, and JillEllyn RileyIn their tween and teenage years, girls become dramatically less self-assured—a feeling that often lasts through adulthood. The change can be baffling to many parents: Their young girls are masters of the universe, full of gutsy fire. But as puberty sets in, their confidence nose-dives, and those …