First, I want to express my sorrow at your story, my admiration of your strength, and my wish that the future is better for you.
I am one of those people to who was raised in a family that was hostile to homosexuals and the transgendered, and this has left a mark on my behaviour towards people like yourself. It is something I am rather ashamed of.
For myself, it came from religion. I've since moved beyond what I was raised with, and I'm happy that I've been able to help my family move forward as well.
It's colored my support of the LGBT community, as I support it even stronger due to my own early hatred and current discomfort with the community which was imparted to me at a young age.