I always was even before I had a term for it. Sexism hit me as young as 4 or 5 when family tried to force me into gender normative clothing and toys. Being neurodivergent I've never liked traditionally girlie things which was evidently a big problem for my extended family. I never got the cool dinosaur or dragon toys I wanted.
Growing up the sexism and displacement from the things I actually enjoyed just got worse and worse.