It's knowing in parallel that everything you're seeing is there by design, with intention. It's there for a reason. The direction, lighting, set, and sound design, and even the "background characters" all contribute to the movement, the mood, the emotions, the experience being witnessed, and the character development as it unfolds.
The more you embrace that your own movie will fade to black, the richer every day can be. An exchange with a cashier or barista, the colors of leaves on a tree against a sunrise, time spent with somebody you will regret not having more of once their own curtain has dropped. The value of friendship, family, and strangers. They are all supporting characters to your experience as you might be to theirs.
This conscious consideration gives you an enriching insight into your good fortune. And to how our collective and vastly interwoven stories are simultaneously playing out in parallel and in real time.
The more you practice, the more you become capable of watching yourself on the screen from the theater seat. You may even start to recognize who's writing the script.