It is scarcely conceivable that a teenager happening to watch Goodbye First Love, the third feature-length film by Mia Hansen-Løve, would recognize her or himself in the lead character of Camille (Lola Creton) or in her boyfriend Sullivan (Sebastian Urzendowsky). That is, unless said teenager was one of the precious few to have weathered the dicey plunge into adolescent romance without the trepidations, fumbles, and emotional