By Maciel Bustos Rating: PG-13 (for thematic elements and some sexual material) Genre: Drama Directed By: R.J. Cutler Written By: Shauna Cross In Theaters: Aug 22, 2014 Wide On DVD: Nov 18, 2014 Box Office: $50.5M Runtime: 1 hr. 46 min. “If I Stay” is about a musical prodigy named Mia who must decide whether to…