So I was on the shitter about half an hour ago (you're welcome for that information btw, for those who were about to thank me) and I was just thinking. I once subscribed to the concept that there is a possibility that there are many many universes (practically infinite) with practically infinite possibilities (if you subscribe to the multiverse concept), in which different decisions were made or different planets collided or whatever. But it got me thinking:

Why should those different things happen? The only case in which it would happen is if the universe started with different fundamental forces, or a different amount of energy or whatever, or had different mass or something (Even slightly). Other than that there is no different for anything to be different. Now I don't like being a downer or one of those people that say freewill doesn't exist, but we're looking at ourselves from a biological standpoint. If you look at us from a physical standpoint, there is no reason for any individual action to be different. Let's imagine it like the asteroid that destroyed the dinosaurs, you could say imagine a universe where it's not there. But if it started exactly under the same circumstances that we did, why would it not? The exact same planets and asteroids would form, same planets would form, and other asteroids would bump into other asteroids to get that asteroid to reach and hit Earth. Anything short of it would be magic.

So if we look at ourselves from a physical standpoint, it's highly unlikely that (on the human level at least) anything would be different in other universes. If those universes started out even slightly differently, they would be completely different. Imagine there was slightly more energy in one universe, perhaps Earth would never exist, but it could only happen in that sort of way. In my opinion, unless an EXTREMELY advanced society perfectly plans out and calculates every single thing for something to happen but slightly changed (Again this would be massive, unlikely, and unnecessary) to such a perfect degree that (for example) you did take that job interview and became rich or something. So in my opinion it's near certainty that there is only one of you in existence. This is only assuming a natural universe in a multiverse of course (this is something that I don't believe in but I find to be very possible and very logical, assuming it's a natural universe). And also that whatever happened at the beginning, guarantees a certain outcome and each point. That even our thoughts, if in the realm of physics (which again, they are, if you subscribe to the idea of a natural universe), are set in stone and those future actions will happen.

We make the choices, yes, but those choices cannot be different, just as an asteroid that wiped out the dinosaurs must happen if a universe starts under exactly the same conditions as us. So free will in my opinion isn't necessarily an illusion, simply that whatever happened 4.7 billion years ago sets forth the same thing. Similar to how in physics if you repeat the same thing (in theory) under the exact same conditions, you should receive the exact same results. Logic (in my view) dictates that it works across universes if those same laws and starting conditions are exactly the same. I don't know if I'm explaining it right, feel free to correct me on any points or to ask questions cause I'm not sure that I wrote this completely coherently/correctly lol.