I've only had this problem with a few books, but the circumstances were a little different. Either the writing style left me feeling bored or the story was nothing like what the jacket lead me to believe and thus, I felt the need to walk away from the book.
I think you just need to find something that really sparks your interest, or an author who's writing style appeals to you.
Maybe if you tell us a few authors or books that you've loved or found hard to put down, someone on here might be able to offer similar titles for you to try.
You could also try goodreads
. When you make an account and rate at least 20 books that you've read, the site will offer recommendations by genre, based on what you like.