I wouldn't explain myself as an expert in the fields of Harry Potter, but I would describe my knowledge as 'above the average'.
I'm working as a programmer in the field of automotive applications and infotainment while studying 'Information Management Automotive'. Currently I'm working on my Bachelors Degree.
Whenever I have the time I meet with some friends, where we discuss a lot about Harry Potter and try to find answers to some of the unanswered Questions. I have to say I'm not a Fan of Answers given by J.K.Rowling that have nothing to do with the things that happen in the books. I appreciate Questions and Answers that are explained and based on the books and not just any Interview given afterwards.
I also am a great Fan of Lord of the Rings and Star Wars.
Of course it is happening inside your head, but why on earth should that mean that it is not real?