The better looking a woman is, the more insecure she will be.

Rightly or wrongly, society prioritises looks and accomplishments.

The less sexually attractive women are acknowledged for their accomplishments, whereas the better looking a woman is, the less importance is placed on her accomplishments.

This is the way of the world; through no fault of their own, beautiful women will be extremely insecure, because there's no way to activate any kind of change of social change, and their looks are 95%+ of their social status.