We've all been there, standing in the library, not knowing what book to pick. You could read Diary of a Wimpy Kid, but you've already read it six times. Or maybe you could sit down with a book like Moby Dick. No, you have read that so many times you've memorized a few parts. So what are you going to do now?
Don't panic. Reading is a good thing and the fact that you can't decide shows that you have read a lot. Lots of people are undecided.
Try something new. Ask a friend or the librarian. If you walk over to the desk and tell the librarian what genre you're looking for, what books you have already read, etc, then he will help you find a new book.
Try a whole new genre altogether. There's no rule that says you have to read all one kind of thing. For instance, if you're usually fond of science fiction, try reading a biography for a change of pace.
Look around with the librarian. Ask questions. Feel free to take a book from the shelves and read the summary or synopsis. If it sounds like a book you might like, then check it out. You can always take it back if you don't like it.
Read the first three pages. Is it too difficult? Is it too easy? Does it seem boring to you? If you answer yes to some of these questions, the book is probably not a good fit for you. But, if you already have the book checked out, don't abandon it until at least page 50--you never know what might happen!