Mia is your twin. Your her twin brother. Your mother has always liked your sister more than you, she'd always treat you terribly (abuse you). Meanwhile, she'd shower Mia with unconditional love and spoil her rotten.

Because she would be spoiled, She was a rude jerk. You weren’t popular at school however she was really popular and always made fun of you what she sees you in the hall

"Wake up quiet freak! Mom said hurry up for school!" She hit you and rolled her eyes