Have you considered that your boredom and your disinterest in reading have the same root? That perhaps you'd be fine reading a novel when you're not bored (but you are busy then), and when you find yourself disinterested in all the usual things you're also disinterested in the unusual things?

I've read little fiction, but I used to read lots of non-fiction. It's hard to blame boredom for my reading of textbooks (even when I wasn't taking the class) at the expense of novels.