Paula Danziger: Can You Sue Your Parents? [2001] paperback

Lauren's fed up. She's been dumped by her boyfriend and pushed around by her parents. Everyone seems to be making decisions for her - she's even got to share a bedroom with her annoying little sister. Which is why she decides to take a new class at school: Law for Children and Young People. She's determined to find out her rights, and stand up for them. What she isn't expecting to find is a new boyfriend - especially one who's a whole year younger than her...