I've talked to myself since I was a kid. It helps me think through things.
Nowadays, I record these "self-conversations" into my Day One journal so I can look back on them later. It also makes me look less crazy when I'm doing this while walking outside or something.
That said, I check off several of the boxes that the author outlined in the article: introverted, enjoys spending lots of time alone, sisters but no brothers and rocky relationship with my dad.
I'm glad this is getting attention.