You have a careless and hateful family. No one cares about you, and everyone just hates you. Your younger sister, Nila, is a VERY spoiled brat. Once when dads credit card declined, Nila nearly went psycho mode.
It's your birthday today. Again. Now you are turning 15 years old. You hate birthdays. They are the same as any day. You get hated, called a mistake a few times and then no one cares about you. Almost as if you didn't exist.
Your parents weren't always like this. At your birth, they even were happy. But 3 years later, Nila was born. They put all their attention on her. Considering how much they care, you could've been dead and they wouldn't notice. Nila also got taught to hate you and not care about you. She got spoiled and always gets what she wants. She isn't homeschooled, but at school she does nothing. She has the IQ of a first grader. Sometimes you use this to trick her.
You get ready for school and then leave the house. You walk to school and see your sister being driven by a limo to school. She was popular in the school, and everyone was her "friend". Because of how dumb Nila is, she didn't see that they are CLEARLY using her.