What is My Life

Right, so I've somehow fallen into the HP universe. Somehow. Does anybody know a way out of here? No? How about a guide to not changing the story? ... I'm doomed, aren't I? (OC-centric. A young girl falls into the HP universe, but doesn't want to be there, doesn't want to change anything, and really, really, under any and all circumstances, doesn't want to become a Mary-Sue.)