This is the hardest thing you will ever do.
My brother was pretty accepting of this. But my mother and father have basically turned their back on me.
I have not talked to any of them recently and I do not plan to. They do not want me calling, and all I hear from them is that I am ruining my life (and to be honest that is the best thing I have heard from them). If I go out I am putting my life at risk. Every bigoted thing I have heard, I have heard so far from my parents. They are not even religous. They were accepting when I first came out to them, but things got worse and worse, to the point that they said this was wrong and that I was ruining my life, and that society will never accept me. I could go on and on.
But I kept this secret for two long, even when I was caught at 17 and 21 with womens clothing, I made excuses out of fear. I knew how they would react. I lived in fear and confusion, with anxiety and depression issues. But I also was smart enough to plan my life for the possibility of transitioning, even though these fears were there. Staying in school until I got my law degree, focusing on work that would lead me to an idealistic situation to transition.
The truth is nothing that my family has said has happened. They said it would ruin my social life. I have not lost a single friend that I have come out to, some friendships grew. They said it would ruin my career, my employer knows my plans and I do plan on staying here, and they plan on keeping me. They said I would be in danger going out in public. I have yet to run into any violence. Basically nothing they have said has come true. They however have displayed a significant level of bigotry, well beyond what even I was expecting.
Remember you are brave, but what you are doing comes with risk. If you are doing this, it is something that is a must, not a maybe. You still live with your family and are young, so whatever you do could have extremely negative consequences. My transman friend was kicked out when he came out. He did not talk to has parents for two years. This is your risk. Make sure you have some support outside of your family in case this happens. You have to be more careful so you do not end up on the streets, but rather with friends.
To me the break with my family was no big deal. I am closer to my friends and I have been since I was 15. I am 28 and I live on my own in DC. But it took an incredible amount of career and educational planning to get to the point in my life where I could transition, where I had no fear of coming out to my family because coming out came with no real risk other than them not talking to me anymore. I have my own life, and they had no hand in it.
The fear of family rejection and facing ones family is the hardest part. I wish you the best of luck with the rest of your family. Coming out is very tough and what will happen is unpredictible. Just make sure you have a friends number available, a place you can stay if things take a turn for the worst.