I talk to myself all the time.
My wife and I also talk to dead people, she talks to the recently deceased as she’s dressing them, sorting out their stuff etc (she’s a nurse not a serial killer).
I talk to Dave (not his real name which I can’t remember) he’s the FIL of the lady we rent our house from. He died a couple of years ago but a lot of his stuff is still in my garage – he made all these little hooks to hang his gardening stuff from from frame of the steel and concrete garage, which I’ve repurposed to hang spare brake discs etc, but I always ask him first. I hate it when people love my stuff about in the garage, if there’s an after life I’m sure he’s be pissed off if I moved his stuff about without so much as a ‘by your leave’.