I built a wall...I guess

So um, I don't know how this happened, but I seemed to have built a wall around myself, keeping me away from my family. Not a real one, I just mean that I have become isolated. I don't like to talk about my feelings too much anymore, even if they are referring to my manipulative father, because my mother thinks I'm overreacting. I'm fairly sure that she only thinks this because she had an even worse relationship with her father than I do, but I do think that my father is a bit abusive, and I'm afraid of him. I'm especially afraid of his treatment of my mother, and will get incredibly panicked if they mention anything relating to them arguing, if they disagree, or if they even raise their voice slightly. For example, yesterday my mother told me that my father wants her to quit her job, but she doesn't want to, so my dad told her that he would "make a big scene" to get her fired. My heart immediately started racing, and I had to take a walk to calm down. Now, every time I have something wrong going on, I have this scenario play out in my head where everyone in my family turns on me, saying that I'm just "stupid", or "too emotional". I understand why this is happening, considering that my dad turns things on me all the time, if I accuse him of being wrong at any point in time he'll automatically turn it on me, but that's not exactly the point. It's not good for me to be so afraid of talking about stuff, but I don't know what to do. Any suggestions?