Not finishing books you started is something that I don’t see a lot of people talking about, even though I’m 85% certain we all do it.
I hate leaving a project half completed, it makes me itchy and feel anxious. I like having closure, in this case closing a book and saying “I hated this book, but hey, I finished it so I’m entitled to my opinion!” However, because I force myself to finish something I’m hating, I get into a reading slump where my desire to read goes to level zero. It makes me feel like something I loved doing before (reading) has now become a chore.
That’s why, as of 2016, I started giving up on some books. Since then the reading slumps have become less frequent and I’ve come to terms with book-induced anxiety — I got better at managing it, but it’s still a work in progress! I even created a Goodreads shelf called “will-not-finish”. (Look at me, all committed!)