If it's difficult, but you're learning a new skill, expanding your perspective or capacity, or enjoying the challenge, by all means, keep going.
If you're not enjoying it, and the payoff is just having completed it, and you could do a lot more valuable/enjoyable stuff with that time, then stop reading Finnegan's Wake, for goodness sake.
People who walk out of films, though...
There's always the option of resuming it if you feel like it.
Exactly. Sometimes you just aren’t in the right mood/phase if life or simply not ready for the material.
Carrie should be on the bookshelf next to other somewhat recent masterpieces like the Grapes of Wrath, Invisible Man (Ellison's), Lord of the Flies, the Great Gatsby, and Ulysses.
Maybe I'll try again soon, i'm honestly not sure why I've never finished, i like the storey well enough.
This can be quite liberating. On the one hand it’s tempting to work through a book you don’t like but in the end this is often very exhausting.
I also used to look down on a lot of books but now I have no problem reading Stephen King. He is a damn good writer and fun to read.