Struggling to Communicate with My Family

My whole life I've had people tell me I'm sensitive. Now, I realize it was my autism but I can't express to my family when its a symptom of my mental illness, they will say I'm faking it. A few years ago I learned I'm selective mute, my whole life I've been told it was an attitude and that I was just shy with strangers. Even today I couldn't speak when I wanted to and yet again, I was made to feel less than for it. I was overwhelmed and could tell I was shutting down. Everyone was being chaotic about what we were going to eat for dinner. My dad was getting mad and I was being put on the spot to give an answer and I stated what I wanted three times and it got ignored. I went to my room to get some time away from all the chaos and my mom entered my room, asking me if I wanted to eat from two places that I don't like. I couldn't speak. She left and shortly after my sister came in my room asking me the same thing. I still couldn't speak, I wanted to speak but I couldn't and I was forming the ideas of what I wanted to say in my head but it wouldn't come out. She left and I heard her say "She's not answering me, she's just looking at me like a f**ing idiot." Those are the kind of remarks I have to deal with on the daily. Then a few minutes passed and my dad came in my room. I could tell he was mad. He asked me "Do you want something from wingstop or no?" in a stern voice. I shook my head. I don't like wings. He left and I got nothing to eat tonight. I've been begging for groceries for the same reason and all my dad has to say is "we have groceries, you just don't want to eat them" I'm sorry I don't want to eat pizza rolls again after eating them for a month straight, because again, we dont have groceries. Pizza rolls and cereal arent meals. Ive been eating them breakfast lunch and dinner. Im also lactose intolerant so it has been painful. I feel like im being punished for not liking the same things they do and not being able to communicate it in fear of the reaction being worse. It has happened before and it's made it harder for me to say something. I'd rather not eat tonight than eat pizza rolls or cereal again. I'm going to try to sleep off the hunger.