RavenclYou're not even real You underestimate yourself as well.
This is all very chicken VS egg. There's no real way to say which one came first, and you can't have one without the other. But at the same time, you're talking about being from books and a potential multiverse which all sounds like something from a bad sci-fi movie from the 80s.
But...you're not exactly on a bad track, either... Reality is based on what we perceive at any given moment, so even fantasy can, theoretically, be real if we believe it to be. The only problem with that last question you asked is that what I feel is insane. Which is more of a normal state of being for me than you might think.
Don't apologize, you've got good points. Have you ever considered studying psychology?