I didn't like cartoons, so that took away some of the competition.
The early book-length reading material I recall consists of kiddie biographies, and SF, from the Wynnefield Branch of the Philadelphia Free Library. Since we moved to New Jersey when I was seven, that provides a date. I did not much follow adult suggestion as to what to read, except for school assignments.
Back as far as I can remember, I've been a big newspaper reader. My Dad brought the late lamented Philadelphia Bulletin home each evening, and I read that, starting with the front page stories.