Long dreaming of stepping behind the camera, actor Alex Pettyfer (I Am Legend, Elvis & Nixon) made his directorial debut of recent with the Tribeca-premiering Back Roads, in which he also stars. Based on a novel by Tawni O’Dell, Back Roads centers on Harley (Pettyfer), a young man living in backwoods Pennsylvania who is forced to become the caretaker for his three sisters after his father is murdered and his mother (Juliette Lewis) is sent to prison. Reading the script…