Is everyone in this world me?

Maybe each person in this world is a different kind of me and everyone together are all the possibilities i could be in life. It's like I have dissociative identity disorder and each person in this world is another personality/identity that I made up which means - if I made up YOU and everybody else, I'm the only person in the world! and everything in this world, EVERYTHING, was built/made by me and me only. Maybe I'm just a test of god to see how I develop the world with the help of the billions of my different personalities. But who is god? and why would he do that? and how god was created? is this world really beyond of what we can think of? there must be something else incomprehensible. Are we(-me?) ever going to find what is it? maybe this is the purpose of life? is there a purspoe for life at all? which we don't know about?