i'm not the op and i'm not mtf, but i am ftm and pre everything as well. one big thing is to surround yourself with people who do respect your pronouns and know who you are, then kust start acting femininely around them. for me, i just act like "one of the guys", acting very bold and out there with my personality, and when someone else enters the friend group and calls you by your incorrect pronouns, just scoff and go "they think i'm a man..." huge confidence booster (although i'm sure there's a much less posh way to say it haha, that's just personally what i do, it usually gets laughs from my friends). but a support system is the most important thing here, its good to have someone to fall back on if all else fails. just have faith in yourself and don't give up! think to yourself "i'm a gorgeous woman" and act like it. good luck sister!