This happened to me so much as a kid. From being bullied up until 7th grade for “looking like a boy”, to adults mistaking me for a boy (it happened once in high school, oddly enough, but th e teacher was foreign, so I gave him the benefit of the doubt). Part of it was my hairstyle and i believe part of it was just that I appeared androgynous so unable to tell gender + short hair + baggy clothes = boy.
It killed my self esteem. It’s one thing if people make fun of different things about you, it’s another if everyone makes fun f rhe same featur/appearance