I fucking hate divorce, need some advice for my future?

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Okay I'm 14 and just finished 9th grade at the end of last year. My parents have been divorced for 10 years, my mum still hates him. And it hurts so much when i think about their last fight because I was present, hugging my mum. When I finish school, I plan to move to the US. My dad has a citizenship, a new wife and 2 daughters. I rarely see them since I live in Australia and they are only 6 and 2 so they are too young for facebook or something. I want to quit school but I'm going to need money since I want to fly back of Australia occasionally to visit my mother's side of the family. When I finish school I will be about 17 and a half. I want to be there for my little sisters even though their mom hates me, we really bonded when I first met them on a holiday in Vietnam

Is there anyway I could go there for a year of school for year 11?
Question is How do I get my father to sponser me to the US?
And how to make my step mom like me, i've never done anything to her and she hates me?
I'm not going to tell my mom since she won't let me go?
And is university better in Australia or America? (I don't know what course to do)