I don’t know enough about schizophrenia to know whether “Fear of Rain” (2021) is portraying or exploiting the condition, but as a film, it’s quite compelling. It follows a path laid out by “Conspiracy Theory,” the 1997 gem with Mel Gibson and Julia Roberts that illustrated the idea, “just because you’re paranoid doesn’t mean they’re not out to get you.” This time we’re in Young Adult Dramaville as a high school girl struggles to filter reality through multiple demons: teen angst and a crowd of voices inside her head. Someone’s in danger, but can she – and we – figure out who?