Tackling the relentless pressure to succeed that's driving girls to despair
https://edition.cnn.com/2018/02/28/health/girls-perfection-depression-anxiety/index.html
Not only girls but also those who don't have enough self-confidence try to compare themselves with their friends.
I guess the reason why more and more girls are likely to get stressed is the change of the objective girls that they want to compare with.
Before invention of telecommunications, compared ones are limited in nearby friends. But, after invention of radio, TV,and Internet, they have been able to see the greatest girls in the world. So, accessibility to greater girls have made them feel misery by comparison.
So, teachers will have to convince students of the fact that people on TV or Internet are beyond our ability.