I feel you, I've only now gotten to the point that my mother doesn't throw out all my boxers. Still have to hear that sickening birth name in my own house, still have to be she and her and daughter, still have her flip out at any mention of it. She still says it's in my head and I made that choice. Yes, because this is the latest fashion and I really just love the idea of torturing myself for a fashion statement- me, the kid who never gave a flip what anyone thought of what I wore or said or did? Get the hell outta here.
See, you're lucky though, I saw your picture and wouldn't ever think girl if I saw you on the street. Unless there's some sort of neon sign attached to you that says "I AM BIOLOGICALLY FEMALE" or something ridiculous like that, I don't see how you can't pass, maybe unless you've got someone outing you everywhere like my well-meaning friends I haven't come out to yet (working on it, was busy).
Anyway. Plan-making is a good thing, this is a great time to get a jumpstart on that. Also setting your mind on the future helps you get through the present, so keep a clear and realistic goal in mind. You can do this, man.