I have possessed the body of the protagonist

A romance-fantasy fan finds herself transmigrated into an unfamiliar story, but cannot tell which book—or even what kind of world—she has entered. She has read so many novels with freckled, brown-haired maids, southern ladies marrying cold-hearted northern dukes, and black-haired male leads paired with blonde heroines that none of those familiar patterns helps her identify her new situation. She is not even sure she has become the female lead. Left wondering where she is and who she is, she tries to make sense of her mysterious transmigration.