I think you have pointed out in your origional post what the problem is. If you read it to yourslef again you will see that the things you like to read are things that you are interested in, which is the same for almost everyone and the reason why "studying" can be difficult, people are often not very interested in what they are reading and their brain switches off. So in my opinion you must be trying to read the wrong kind of books. As someone else mentioned read a book about body building or an auto biography of a famous dog trainer or something.. haha
I find it very hard to read books but once i get past the first chapter or two i usually can't put the f*cker down! I know i will get to that point so keep reading until i get into it.
Books have the purpose of either passing on information or for entertainment. it would seem that you like to read to gain information, for example cars, body building, dogs... etc.
Perhaps reading for entertainment just isn't the way your brain likes to spend its time.