I was trying to figure out how mirrors work and fell down a rabbit hole of quantum physics videos. Is probability a real thing in quantum physics? For example, if you have two opposite events with the same probability, say two opposing paths of a photon, does the universe actually calculate the probability and then makes the photon go another way? Doesn't that imply there's some kind of a universal processing unit that calculates probabilities? I'm scared, please tell me that's not how it works

For reference, this is the video I got stuck on

https://www.youtube.com/watch?v=rYLzxcU6ROM

The bit I'm talking about starts at 7:26