Sci-Fi as a Genre

I do not enjoy reading science fiction novels. I have read quite a few science fiction books, finding many of them dull and difficult to follow. There is one exception, though. I actually liked 20,000 Leagues Under the Sea, by Jules Verne. But I would usually much rather read a historial fiction novel or a book about something more realistic and true to life. Overall, the sci-fi genre is not for me.