The uproar

Lately there has been a lot of things going on in my house. My mom's boyfriend is crazy and controlling and she doesn't see just how bad it is because he's paying for thing in the house. He's only been here about 6-7 months and he's taken over the whole house. I can't snap at him because I risk getting kicked out or cut off from everyone. He's got a horrible alcohol dependency and when I said something he flipped out because a "kid" was making the rules. I have no idea what to do anymore, the only place I have is my room and even there isn't completely safe. When I go out places he goes in my room and it makes me uncomfortable and very upset. He treats my 13 year old brother like a criminal and my brother has started acting out with this guy in the house. My mother's boyfriend was nice and fun the first few months but now he's taking hold of everyone's lives and it's horrible. My emotional disorders and my mother's are made fun of so often. MY brother had his first big bad panic attack and was told that he was using panic attack as an excuse. My mental state has gone to hell, I used to be so sweet and nice now I can think of nothing more than isolating myself and wanting to smack someone every time they talk. I just can't imagine living with this guy pushing everyone around controlling us all for the rest of my time living in this house. No one will dare help me and my mom is too blinded by the fact that this man is paying for things she needs and the fact that she doesn't have to deal with her kids that she won't even talk to him about the issues she doesn't even see some of the things he does as issues. I don't understand why this all has to happen and why nothing changes no matter how much I'm trying.