I feel like the reason I dislike reading or find reading boring is because I can't. But it's just a theory. Meanwhile I absolutely love movies.
This is quite common if you have full on aphantasia.
I have a friend who only reads fiction for which he's seen the accompanying show first because he otherwise has no visual reference for the characters and environments.
FWIW, there’s a famous(-ish) fantasy author with aphantasia (Mark Lawrence), and I also have aphantasia, yet I absolutely love reading and if I would have to choose only one entertainment for the rest of my live, it’d be reading.
But I can’t stand elaborate descriptions (it’s almost always landscapes, rarely do authors feel the need to describe anything in as excruciating details as landscapes), which might be related to those descriptions not building up to some kind of image in my head.