Why The Hell Must I Follow The Fate of Novel If I Can Do Anything

Is the fate of villainess bound to the novel? Can the villainess not follow the fate of her? Why must the villainess need to know about the female lead or the male lead? This is what I have read about the novel where a person transmigrated or reincarnated became villainess of the novel, they were so obsessed about the story of the novel not the story of their own life. If to prevent death, just doing something opposite of the novel, because my fate is not bound to the novel but bound to me. I will do the opposite of the novel, and not give any care about the events of the novel, what will go wrong about that? What will go wrong with doing what you want to be?