in the story you are the older child (or younger) sibling of Elaina, ever since she were born you weren't shown as much love as they showed to her.
Your parents made it quite clear they had their favourite, Elaina got everything she wanted, birthday Christmas or any other day she got it. And when it came to you, your parents gave you nothing really. Only waiting for you to become 18 years old and kick you the hell out of the house, they gave you a credit card but no money. Expecting you to be working already (you aren't 18 yet!)
Once Elaina started going to your school and classes she gained popularity very quickly, she caught the attention of your crush (IF you even have one). And took all your friends away from you (again if you have any..)
It's not really possible to change the minds of your parents, but if you want to try, then you can. Good luck!
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[Reminder;no matter what others say you are always beautiful/handsome and talented. Don't let some silly insults get into your head!]