I have gender fluid and non-binary friends, I gotcha! I’m really sorry that people are misgendering you, I can’t exactly empathize since I’m cis but i know teachers misgender my close friend all the time, it seems like it hurts. I wish you lots of luck for telling your friend, if they’re a real one then they’ll support it and stick by you. Remember to always march tot he beat of your own drum and don’t change for anyone! My friend once came out to a group chat over text when somebody in passing said “she” and she remarked quietly “actually I’m not a girl,” it did take everyone a while to notice but everyone supports them and uses their pronouns now!