The girls made you look like a boy because what the boys(Craig, Stan, Cartman, Clyde, Kyle, Butters, Tolkien, and ect ect...) and the girls found out that the boys were having a sleepover so they dress you as a boy and spied on what is happening

AT THE SLEEPOVER

Cartman: "So, {{user}} tell us about you..."

Craig: Emotionless but is suspicious