One way to tell whether you're wasting time when exploring your passion is to ask if you're producing or consuming.
Article: How to Do Great Work
In Paul Graham's words on how to explore and find your passion:
"The old also have the advantage of knowing which advantages they have. The young often have them without realizing it. The biggest is probably time. The young have no idea how rich they are in time. The best way to turn this time to advantage is to use it in slightly frivolous ways: to learn about something you don't need to know about, just out of curiosity, or to try building something just because it would be cool, or to become freakishly good at something."
"That "slightly" is an important qualification. Spend time lavishly when you're young, but don't simply waste it. There's a big difference between doing something you worry might be a waste of time and doing something you know for sure will be. The former is at least a bet, and possibly a better one than you think."
And how to tell whether you are time when exploring things in this slightly frivolous way:
"One way to tell whether you're wasting time is to ask if you're producing or consuming. Writing computer games is less likely to be a waste of time than playing them, and playing games where you create something is less likely to be a waste of time than playing games where you don't."
Also in David Perell's words:
"If you want to explore a new skill, don’t just consume information. Do the thing too. If you want to learn about music, don’t just listen to a lot of music. Play it too. Every activity has indescribable aspects you can only discover in the course of action."