I'm the only person in my home, but am I really "living alone"?

I have a dog who follows me everywhere.

I live in a downtown high-rise in a major city. I see and hear people all around me every day.

I have a remote job, but people are on my screens -- their voices filling my space -- talking to me throughout the week.

It all makes me wonder: what actually makes someone feel like they are "living alone"?