What we're all getting at is is intellectual maturity with abstract arguments. At the high school level this comes with the tougher math courses and science courses like physics. But many don't get it till undergraduate level, and some (sigh) never. If you haven't made the breakthrough into abstract thinking then most of the books mentioned will frustrate you, and certainly you won't be able to get off the ground with Road to Reality, which is a wonderful book, but a real challenge to even the highly knowledgeable.
By the way, to add to the non-mathematical intro books, Nick Herbert's Quantum Reality which is still in the stores, and Heinz Pagel's Quantum Code, which I don't think is, but your library may have it.