I'm really sorry to hear that. That's abuse, plain and simple and only teaches you to hide it. Thankfully, I was raised Gender non-conforming, even in a cult like church. What blows my mind, is that no one at all, noticed that I had a girls body. Like I never had a male puberty, and have always had a higher pitched voice. I even had small breasts at the early age of ten.
I was unfortunately, a victim of secrecy at the early age of eleven. This nurse asked if my testicles had always been the same size. I told her yes, and she told me to let them know if I gets bigger than the other. I never asked why, because, I just assumed it was normal at that time, but she never told my Mom ether. I mean, that's something you would say to like a 40 year old male.
I'm not really sure when I started to have gender issues per say, but I do know that by ten, I felt I should be wearing girls' clothes. Then I learned about Transsexuals at fourteen, and kinda figured maybe that's what I was. But looking back, I had a really big doubt in the back of my mind about that. I think it had to do with the fact, I was never like the other boys as I grew up. I was always the runt of my classmates, and never quite acted like them ether.
I wish you the best of luck in your transition, and that you've found happiness.