The summer I turned pretty -Jenny Han

When each summer begins, Belly leaves her school life behind and escapes to Cousins Beach, the place she has spent every summer of her life. Not only does the beach house mean home away from home, but her favorite people are there: Susannah, her mother's best friend, and her sons, Conrad and Jeremiah. Belly has been chasing Conrad for as long as she can remember, and more then anything, she hopes this summer will different. Despite distractions from a new guy named Cam and lingering looks from Conrad's brother, Jeremiah, Belly's heart belongs to Conrad. will he offer his to her? Will this be the summer that changes everything?
(The actual book)