It might be that you’ve found your personal reason if it seems unreasonable to everyone else.
Some things you do might do for money. That’s a reason everyone gets.
Other things we do for no extrinsic reason but just because of their nature. That, too, is a reason that everyone gets. We revel in a hug or great music, savor food or beautiful art simply because that’s part of the human experience.
Finally, there are things that you do simply because that is who you are. How can you explain why you’re compelled to write poems, play the ukulele, make fun of jokes, walk the high wire, juggle, or collect found art that others would categorize as junk? If there is no reason outside of the thing itself, it might just be your own “raison d'etre,” or reason for existence. (Or at least one of the reasons.)
If, by contrast, you have a reason for doing the thing other than that thing itself, it might just be that you’re still at least one level removed from your true passion.
To others your passion might seem unreasonable but perhaps it is simply the case that the thing is not so much unreasonable as something that is its own reason.