When I was a young child like from 3-10ish I didn't think about what I did, I didn't know what this chord was called or that, or what scale I was playing, I just played and corrected myself if there was a wrong sound. But as I got older, my observation of patterns, common structures on the piano strengthened. This meant that when I played I became more and more consciously aware of what I was actually doing, and this meant that I had to deal with two methods of thinking. "Automatic playing" just playing procedure that I had been practicing over and over again and also "Thoughtful playing" when your brain starts to consciously observe what you are playing.
I have found in my experience in public peformances that these two thought processes move inbetween each other more frequently because of nerves and especially difficult techniqcal passages because you really want to make it clear so everyone hears it nicely controlled/cleanly excecuted.
I find that I am probably 90% of the times in Automatic Playing state, but now and then my brain says, HEY WAKE UP, THIS PART NEXT YOU MUST FOCUS, MAKE THIS CLEARER, ESURE YOU REALLY DRAW THAT OUT etc. When I was a teenager I would totally stop in the middle of a peice if this happened, or play wrong notes and totally stuff up, forget where I was. I learn't that you have to know how to play automatically, and also play with full conscious attention to your fingers and where they move. Perhaps not observing NOTE by NOTE each figner, but definatly a more conscious observation of the fingers and action. while you practice. I sometimes play a game and force myself to think about the notes in sections which are normally automatic. This just practices thinking in places you normally wouldn't, a trap which can stuff you up in public peformance.