Stargirl by Jerry Spinelli

Stargirl is a person who you might think is strange. She has a pet rat, sings happy birthday to people at school with her ukele, and dresses wierd. But she's still a person in her own way. She falls in love with someone named Leo, but then people act like they can't see or hear them. When Stargirl moves, changes make like she was never even there. -Katherine