I feel ya. When you drop the bomb, it's the people closest who take the most damage. They feel as though they put so much time and effort into you that when you say you're trans, they feel like you're spitting in their hand. Obviously, this isn't reasonable: "we put so much effort into you, you owe us!" Imagine if they used that argument on a blind person. You didn't ask to be trans any more than they did, you just accepted your truth and are acting on it. You should be praised for taking a leap of faith, but in the real world, people are vicarious.
I lost a lot of my family when I came out. It was honestly not as painful as I thought, though I am pretty angry with a few of them. Mostly it just confirmed what I always suspected in my family and solidified the reasons as to why it has been so hard for me to understand and come out about it. People put their failed hopes and dreams into you and when you refuse to live up to them, they have to face their failure. But they've never had to do that, they've had you their whole life to put it off onto, and they're certainly not going to own their inadequacies now.
This is my mother. After eight months of trying to get her to understand, she demanded that I apologize to her and her husband and tried to dictate how I speak (literally, the range of pitch I was allowed to speak in), what to wear around her, and what subjects to discuss. Oh, but she loves me! When love is that conditional, leave it behind. So, I cut her out of my life and consequently, most of my family cut me out of theirs. It sucks when you realize just how frail of a bond family actually is, but I'm honestly happy that I am seeing the lie now. I know who my friends are.
I'm not saying cut your family off, but I am saying stick to your guns no matter what. You are in control of you and your body and your decisions. The bad people in your life try to sell you what you desire for an ugly price, the good people will give it to you for free. You have done no wrong, so you owe your family nothing.