Penis envy is a term that was created by a man named Sigmund Freud who was a doctor who studied people's brains and feelings. He believed that girls felt jealous of boys because boys have something called a penis, which girls do not have. He thought that this envy made girls feel inferior to boys and have lower self-esteem.
But, in reality, girls do not actually envy boys because of their penises. Instead, girls may feel frustrated that society values boys more just because they have a penis. This means that girls might feel like they are not as important or capable as boys just because of their gender.
So, in short, "penis envy" is not something that girls actually experience, but rather a mistaken idea from a long time ago that has been proven incorrect.