I feel for you so hard every time I read your posts. My relationship with my parents was so much like this was I was a teenager, and it absolutely tore me up. It's hard when you're a minor and there's nothing you can do but hold on and make it through school. I wasn't out as trans to my parents in high school, and they didn't know I liked girls either...I was a "straight girl" on my best behavior, and I still had things said to me that I will never be able to forgive, because they still linger in my mind now.
That being said, I can tell you one thing from my experiences. This isn't about you, or about your transition. As soon as my dad found out I liked women, and later that I was trans, it was his go to excuse for everything he did. "Oh, well this is so hard to deal with!" That's what he tells everyone. But it's a lie, because he was almost worse before I was out as any of those things. I've thought about these things for many years now, trying to piece it together, and I have come to the conclusion that my parents are very damaged people in their own right. When they got frustrated with me, for whatever reason, instead of trying to communicate, they would do things they knew were hurtful just to shut me up. They didn't care, as long as I didn't make a squeak and did what they wanted, it didn't matter what means were used to get that result. They got frustrated, and they got lazy. And that was wrong. I wasn't an adult. I was on my way to becoming one. I wasn't capable of functioning as an adult in that relationship - although I wasn't a bad kid by any means (no drink, no drugs, no cellphone, no parties, top grades), if they believed there to be a problem, they were my parents and it was THEIR responsibility to find a way to guide their child and lead me to adulthood. Their abuse and criticism did nothing to help me grow, if anything, it has stunted me significantly. Relationships are hard for me because no one taught me to function in a loving relationship with others. All I've ever known is manipulation and hurt, and I should have been taught better because that's an adult's responsibility. That's part of having a child, sorry to say. I'm not saying either of us needed guidance as no one chooses to be trans, but your parents have the responsibility to care for your emotional development and they are failing, big time.
So I'll repeat two things that you need to remember:
1. It's not your fault.
2. Don't try to hold yourself to any high expectations in terms of communicating with these people. Don't feel you have to say the right thing, or do the right thing, to make them "get it." You don't owe them that, because you are not the parent - they are, and they failed in their duty to take care of you. My advice, stay under the radar, work hard, do your best to set yourself up for your future, and just walk away as soon as you can.