What is shared girlhood?
Shared girlhood is the idea that girls growing up under patriarchy are all oppressed based on their being treated as girls when they were younger.
For example, we’re told we exist to please men and be pretty, or we experience unwanted sexual harassment or contact, or we’re told to be small and eat less than boys.
There are obviously huge differences based on race, class, nationality, etc. But there is shared oppression based on sex.
When we grow up and become women, our experience as women is shaped by the way we were oppressed growing up.
Thus, growing up as girls is an important part of being a woman.