I hate my step mom someone please help me?

Ever since i was five i have always hated my stepmom. The reason of this is because she treats me terribly. If i was her blood child she would love me more. And the weird thing is we got a dog a while ago and ever since we got her she just FELL IN LOVE with it. she like o i love you.... your so cute...... and she will freak out if she squeals and will be like what did you do ?!??!?! And im like UGHHHHH nothing. I talk back sometimes but not alot. And she always yells at me when my dad is not around. Please help me!