I think it is very common and natural for people to do it. It's what makes us human, I guess. My very NT mother will talk to her GPS, sometimes more than she does to me when we're on a road trip, and she even calls it a she because of its female voice. I wanted to call that GPS a lot less printable things after we went to New Brunswick last summer and Mom took forever to find places we wanted to go that turned out to be within walking distance from our hotel because the GPS was outdated, and she nearly got us killed while trying to find a place to eat at night while it was pouring with rain out. When her birthday came a month later I got her a map book of all the Atlantic provinces.
But I don't understand why it's supposed to be strange to talk to animals. I thought everyone did that. Is it only because they can't to us (with words) that it's supposed to be weird? When I interact positively with my cats by petting or cuddling talking is just part of it. I guess it's weird if I ask them questions because I know they can't just answer me.
I also talk to myself quite a bit. And I don't always just talk to myself, I sometimes will tel myself stories and jokes or even read books out loud. I live alone so there's no one else around to talk to and even if there was they probably wouldn't care less about what I wanted to say.
My NT wife talks to Siri. Best part is that Siri doesn't constantly interrupt her, like I do.