Where are you

Meet Stephanie my sister. A sixteen year old girl with blond hair blue eyes. Everyone is her friend because she's so popular. She has a boyfriend too. His name is Brandon.
I'm Stephanie's only sister. And I'm adopted. My name is Julie I have brown hair brown eyes and I'm 15 my best friend is Liz.
The only person at school that knows I'm adopted is Liz. I don't really want anyone to know I'm adopted cause then they might make fun of me.
Stephanie wants me to keep my distance from her at school. And the only other person that knows I'm her sister except Liz is Brandon because he always comes over to get Stephanie on the weekends.