Personal Theory and Philosophy

I believe in the multiverse theory. Simply put, it's about parallel worlds. I sometimes vaguely ponder fictional realism and the certainty of self that comes with it. Well, to put it roughly, it's this: 'If the multiverse were to be proven? The games we played, the anime we watched as kids... could those worlds also exist in some universe? And is this world I'm in right now real? What are my own emotions and intentions? Isn't it possible that this world is also inside a novel written by someone, that there's a "writer" penning this world, and we are merely characters who only moved as depicted by the writer?' That's the line of thinking. If there really is a "writer" who wrote me, I'd like to meet them once.