Parallel World Alternation Hypothesis

Many people have thought about these questions. I am the protagonist in this world, and everyone else is NPC, a foil, acting for each other. Will I change the whole world because of one thing, such as throwing a piece of garbage, and shouting because of the butterfly effect? There is also a parallel world. I am not the only one, I am just one of multiple universes. The story tells about my experiences from childhood to present, with some embellishing. Some stories will be told from two perspectives, one is my real experience, and the other is my conjecture. If you are interested, you can come in and take a look!