All my friends know. My Christian growing-out-of-being-extremist brother knows..
But my parents.. Well; they probably know, but I haven't outright told them. A few months back, at a family dinner, my mother popped the question: Do you wish you were a woman? So I replied: Yes, actually. She just nodded, went: 'okay,' and continued eating.
My father really doesn't seem to care either way, but then again; he never understood what all the gender/sexuality fuss was all about.
I should have been honest and open to my parents when I was five, and asking questions about anything related to reproduction. (Though I did ask, a once, why I wasn't born a girl, and my mother couldn't answer me. My father.. Was way too busy working, so I didn't bother him much.)
During my late teens, I didn't tell because I was too afraid of my father losing his job. He's a reverend for a church, and while that church is quite open to homosexuals, they believe, on the whole, that everything God creates is perfect. If you want to be something else than you're created as, well; you're in for questioning. Not that I really cared; I didn't go to church that often, and had been openly atheist for years, but that was all right. Anyway; I was too afraid that Higher Management might take offence at a reverend's son being his daughter. And I don't know if you know many priests, vicars, reverends or other spiritual leaders, but trust me when I say: Their work is usually their life.
So here I am, hanging from the 'not quite free, but dangling out of the window.' And yes; I've waited far too long. For my liking, anyway. On the other hand: If I had come out when I was five, I don't know what my life would have been like. I might not even have met my partner at all. There's a bright side to nearly everything, if only you look for them.