Damn I been on a phase for my entire life? That's wild.
Okay but seriously if it's a phase you'll figure it out once you try to create a long term project. That stuff will test your dedication. Animated shorts, comics or even series of works...
The first comics I made were when I was about 5/6 years old on copy paper with felt tip pens.
You don't have to make it your career for it to be your passion, either. So long as you get joy from doing it, it's a passion in some measure.
Passions can be temporary as well - hyperfixation is pretty normal for neurodivergent individuals like myself and sometimes we fixate permanently and other times we can switch between interests. My interest in film and comics has been permanent in my life, but the fandoms I'm into can fluctuate and evolve. Doesn't make me any less passionate at any given time!
If you grow tired of it, that's fine! There is nothing wrong with deciding not to draw anymore or deciding to draw less. Sometimes people are just meant to throw themselves into art, and others are not necessarily destined for it in the long term. There is no shame in that.