I hate my stepmom?

Okay, before my stepmom and dad got married, I was all for them being together. She made my dad happy and I know that me and my sister being in his life was great, but he deserves a romantic relationship after leaving my half-crazy mother. They had known each other for years now, and I was all for moving in with my stepmom, stepbrother, and my dad. Previously, I lived with my mother who wasn't always emotionally stable and sometimes took it out on me. At 14, my stepmom and dad got married while I was at a middle school dance. All of a sudden, I had 4 new stepbrothers. My older sister had already left for college, so I was on my own whenthe first red flag popped up. I know not to listen to my biased mom but her friends (who have known my stepmom for years) have said some things about her that make me suspicious of her. Her four sons are all from different men and she has been caught up with drugs in the past. I was, of course, angry that my father had been dishonest with me about who we were letting into our lives, but I was more suspicious. Why did she hide this fact from others and act so into the Church all of a sudden? I feel like a better person would have been honest with their mistakes. Soon, more flags popped up. I noticed that she began clnplaining to my dad about my way of life, and I knew compromise was mecessary,  but I didn't expect to be yelled at every time I accidentally lefy a cabinet open. We would have long talks about how I was doing things that she didn't like, often ending with me having no input abut how I felt. Another part of her past was soon revealed to me when I found out her last husband left her because she was manipulative, materialistic, and bossy. She was the one who pushed my dad to marriage, which I later found out. I became more suspicious as a result. In October 2015, I was diagnosed with lupus. We also had bought a house back then and moved into it. I was excited, thinking this would be a fresh start. I was wrong. My stepmom had started to ignore me and text my dad nasty things about me behind my back, and even told him to "stop letting your child dictate everything" when I got sick and had to stay home sick from school because of my illness. In February, we even tried to leave the house because it was too hard being around someone who had no job, always texted my dad for vodka and/or sex, and treated me like a devil. I admit I could have done more like try to communicate with her, but I was too skeptical at that point and I didn't want another woman in my life to hurt me or my dad again. It resulted in her screaming at me saying I ruined the marriage and that she hoped I was happy. My dad even came to me and asked me if he could get married because he knows I'd do the same for him because we're a team. She screamed at my dad for asking me. Even my stepbrother tried to tell her to stop. Everyone says she's jealous of me because my dad loves me and she knows that if I tried to leave, he would too. She begged us (or my dad, she didn't even talk to me) to stay and my dad begged to stay too, which made my heart sink. Nothing even changed after that. She still talked about me behind my back, ignored me, and made me feel unwelcome. I even saw texts of her saying she didn't love my dad anymore and that he should go eith me so he could be my "punkin" instead. I was disgusted. After seeing that, it was the last straw. This woman  was gonna put me in the hospital with stress and I wasn't having it. I screamed and cried and told my dad I was tired of how she was treating him and myself. He agreed and we're planning to leave again this summer. This is my last year of being a teenager, and I wanna spend it right. I want to know if this is the rught thing to do, and if I'm going about this the right way. I want my dad to be happy and I know he isn'tbeing treated right, and he even hinted by saying he's seen things he didn't like either. Is this right?