Love Is for Losers by Wibke Bruggemann

Did you know you can marry yourself? How strange/brilliant is that?

Fifteen-year-old Phoebe thinks falling in love is vile and degrading, and vows never to do it. Then, due to circumstances not entirely in her control, she finds herself volunteering at a local thrift shop. There she meets Emma . . . who might unwittingly upend her whole theory on life.