Don't kill me my prince

you are a normal girl going to work everyday . On day you were crossing the road suddenly an accident happened you died. When you opened your eyes I saw the decorations were from the medieval times .Then suddenly you looked at the mirror then you saw myself as a character of a novel that you read you long time and in that novel the character you are in is the villainess. Suddenly a maid enters the room and told me to prepare myself it was my wedding .you am going to get married to the prince who is going to kill me in the end of the story. You don't want that fate so you have decided to change the story so that you don't die!