Divine Secrets of the Ya-Ya Sisterhood

I am currently reading the Ya-Ya Sisterhood book.  It’s strange because I am enjoying the story, but I find myself struggling to get through the book.  It feels like it is taking me forever to read it, but, like I do with books I am enjoying, I reflect on the story when I stop reading.  I am thinking about the characters and what is going on and what I think is going to happen and analyzing every little bit.  And yet, I am still struggling while I am actually reading it.  I have never experienced this before and don’t really know what to think about it!  Any thoughts?