Allow yourself to mess around. Dont jeopardize your life of course, but make mistakes with the purpose of making mistakes.
Youll detach from what youre doing and finally enjoy it without expectations.
If you practice a sport or play a musical instrument, you know how this feels. You dont get attached to anything you do, even the coolest trick or most brilliant lick feels just like another instant in time, another step in the journey.
Then you look back and you realize that you filled your life with such moments, and you feel you finally own whatever youre doing.