I was one of those kids. I liked reading and writing better than hanging out with other kids, and I had a lot of trouble paying attention in school. I liked being by myself, which makes sense, because I'm an only child, and so is my father, who was equally comfortable being alone.
They tested our IQs in third grade, and discovered one of my problems: on the first test, I scored 181, and when they retested, assuming the first test was an error, I scored 183. From then on, my parents made sure that my teachers just let me be. My third grade teacher actually built me a little cubicle in our classroom, where I could just go and read my own books, instead of the class assigned ones. I vaguely remember making her a card with a quote from Hamlet inside.
My mother also made the public library give me an adult library card, which didn't restrict me to books for my age level. Both my parents took the attitude that if I wanted to read something, I should be allowed to, regardless of subject matter.
I suppose today, I would have been sent in for psych testing, rather than sent to the grown-up section of the library!