That’s because we do not understand consciousness (like at all) and you need consciousness to “experience” the world, and for example, pain.

No consciousness, no pain.

So to your question; one theory is that everything has a little bit of “consciousness” and it’s just in the wildly complex brain it can actually express it so well, which means the whole universe is somewhat conscious.

I personally don’t think so, but I also know that that is just wishful thinking from my side and that I do not know anything more than that I have, a consciousness.

HTH