Sometimes people are horrible and often downright cruel, but the core issue seems to be ignorance. The way you have been and/or are being treated is reprehensible and unfair. I know what you're feeling, the anger, hurt, frustration and confusion that is coming from one of the people who should understand and not judge you. I was not born Deaf, I lost my hearing at 19 and like you, I chose to be Deaf, learn ASL and find my own identity and I still have to take a step back when my family forgets my choices or flat out ignores them. Your family will most likely never completely understand your choices because they have not had to live your life and sometimes when I get so mad at my family that I just want to scream, I have to remind myself that in many ways I am my family's ambassador to the Deaf community and if I react negatively, it may affect their view of Deaf people and make them defensive when they meet my friends.
I know that how I handle my family may not work for you, but just know that you're not alone.