Space is finite

I’m impressed you figured that out despite it being broadly accepted as likely an unanswerable question.

So every posibilty isn’t really a thing

No, of course not, but by the laws and facts we do know about space at a fundamental level, we know that incredibly rare events can happen, like whole universes. There’s even an equation for it. Roughly ten to the power of ten to the power of ten years before we get another universe similar to our own, and longer still for an identical copy, but nothing really precludes this idea, in fact we have very strong evidence of it happening.

And regardless a copy of you existing is not you.

Also agreed, but how did you end up experiencing this now? And who said anything about consciousness having to exist in a copy? For all you know when you die, you immediately start over a googleplex years later as some insect in a new universe that immediately gets eaten and then BAM something else equally absurd another googleplex years later. It has nothing to do with a soul or anything, just that we know that consciousness is a thing that seems to happen, and universes seem to happen, and you’re here now when you weren’t before. You can believe what you want and it doesn’t really matter, whatever is going to happen after you’re dead for an infinity is going to happen whether we believe it or understand it or not.

We are hung up on the idea of “time” but that’s just because you’re in a body that’s experiencing time. You were dead before, now you’re not. You’re not even made of the same stuff you were a year ago, you’re just consciousness temporarily emerging from a moving collection of particles and mechanical parts. How can you say for sure what’s certain?