Why does my step mom is starting to get on my nerves?

Okay today my half blooded brother was stepping on his toy then i just moved his feet out of the toy my step mom taught i pulled his leg and then she found my socks on in the bathroom i dint know it was in the bathroom because i had to pick up my dirty clothes with clean clothes and it was allot to carry so after that she had a weird look on her face and said can you please pick up your socks can or not like rudely and when i was taking out my braids she said can you tie your hair!! so messy i was gonna tie it after i took all my braids out and she said next time don't take it out until your hair appointment but my mom told me to take it out because my hair appointment is tomorrow saturday and then when my brother was crying she sight and said WHAT HAPPEN! im like he was crying for you then she said tie your hair she been mean to me and my half blooded brother see when i was younger she always slaps me and for now on she says rude stuff to me and one time i was fixing my hair she said your a dirty person think your all pretty which i am LOL but i really want her to shut up and leave me alone or should i always stay with my mom HELP!! :(