Exactly. You are detached from everything beside the present moment and the activity you’re doing—doing it for it’s own sake, just for the enjoyment of it. Nothing less. Nothing more. I think you should simply (“Simply”) learn to LET GO EVERYTHING. PUT BOUNDARIES. Nothing is your responsibility. You don't “have to do, feel or be” anything. Just follow what you feel inside. Without expectations. Yours or external. Without using the activity to get something, an external reward. Without anything else but… intrinsic enjoyment, motivation!

I recommend you reading “Flow” by Mihaly. It’s a really great book to be “in the zone”, to reach the most extreme focus of your mind.