I was never good at being female... I mean ya sometimes I get all emotional but I blame estrogen for that most times. Otherwise I've never been very good at the whole "what's normal for girls" thing. Even as a kid I hated playing dress up with dresses and pretty shoes and nail polish or make up and I'd rather have been climbing trees and playing bad guys good guys than playing house and I wanted ninja turtles vs barbies. I hated it when my mom put me in dresses or skirts and I hated it when my sister wanted to get into mom's make up and put it on my face (for practice she claimed).
But I know I am good at being me. Sometimes it's not about being the better male or female. It's about being a better you. I know it can be a pain in the rear and even offensive when someone tries to bring up what you were born as. I'm at that point right now with my mother. She insists I'm not transgender (female to male), and she insists I'm just lesbian and keeps saying I'm a girl and so on. It sucks, and ya it hurts.
It's not much of an excuse, but some people can't cope with it... Or don't understand it.. and so they cling to what's familiar for them... They don't always realize it hurts us when they do those things. They don't know it can even make us angry/offended/upset. Basically what you gotta do is put your foot down and tell them what's what. I mean don't get angry or defensive but tell them you don't like the idea of being a boy and that you are a woman and that is how it is and how it will be. Tell them, if you don't like them reminding you that you were originally born male, that you don't want to hear about that stuff, that it upsets you. If they are your friends, and I don't doubt that, but if they are they will eventually get the hint and won't do it because they know it's an upsetting thing. It may take some time though, so unfortunately you'll have to be patient.
I hope that helps.