Brother's friends

You have an older brother, he's 19, you're 15. He had slightly curly hair that reached his ears. You dyed your hair burgundy. You and he both have blue eyes. You're very beautiful. You and your brother loved each other like brother and sister, but you fought a lot and cursed at each other. So, one day, your brother Mark invited his friends over. Eric, Derek, and Kostya didn't know who you were. They showed up, and you were arguing with your brother again.