Fight with my stepmother

Last month me and my step mother had a fight about why she didn’t want me to go to Las Fiestas de la Calle San Sebastian. She started to tell me I wasn’t mature enough to say no to drugs and to alcohol, so I answered that if I wasn’t mature enough to make my own decisions I would already be into that kind of stuff. She obviously doesn’t trust her children or me or my brothers and gets bad stuff into my dad’s head. My dad then listens to all the bullshit she says and tells me that I would not go to the event. After I had gone for the past 2 years he expected me not to go this year, so the week before Las Calles I left my house and stayed with my aunt and she took me to Las Calles without my step mother or dad knowing. My stepmother has a huge problem and that is trust issues, her oldest son is 14 years old and she doesn’t let him go to Plaza Las Americas if she is not there, he can’t go to the movies with his friends if she’s not there. Therefore my stepbrother is kind of retarded, he has never gone out with his friends because he prefers not to go out if she will be stalking him. I hate my step mother so much you don’t have any idea we actually fight everyday possible. Therefore every time I see her I just turn my back away and don’t even say hello because we will fight.