Every Last Word, by Tamara Ireland Stone

Samantha struggles to hide her obsessive compulsive disorder from her friends (a fiercely competitive group of popular girls).  But when a shy girl at school introduces Sam to a secret poetry society, the association (along with her friend's encouragement) cause Sam to transcend her condition and consider alternatives to the way she's been living her life.  But she still lives in fear of what will happen when people discover she isn't normal.

A touching story about struggling with mental illness that takes a surprising turn towards the end that amps up the stakes of the story dramatically.  The poetry (and the secret poetry society) seemed a bit gratuitous to me, but the story overall was moving.  Samantha is an intriguing and sympathetic protagonist.  The romance with AJ was a bit forced, but is ultimately touching on its own.  In general, the characters in this personality-driven story are effective and memorable (and even the "mean girls" elicit some sympathy!).