I’ve been thinking lots about your idea that we are all born with a “best friend” that is our mind. The way you describe your experience sounds a bit like my relationship with my imaginary friend. One difference, perhaps, is that I think of my friend as someone separate to my own mind (she “lives” in my mind, but isn’t “part of” it). I wonder if the thing you describe is you, or part of you, or someone separate? Does your best friend have their own thoughts, beliefs, or emotions? Do they have a “body”?
You also describe how ur friend helps u to not feel lonely. My own friend helps keep me company, but I do sometimes still feel lonely, bc it’s much harder for them to be around when I’m anxious. I get so wrapped up in my own worries I can’t pay attention to them w/o making stuff up. Do you ever feel like your friend is more present at some times than others? Do you ever find it difficult to talk/listen to them? How can u tell when you’re really listening to them?
Sorry to answer your questions with even more questions. Maybe you could talk to your friend about some of these things. At any rate, I hope your relationship continues to flourish.
My love to (both of?) you,