Education

But I could read at college level in the 3rd grade.

Actually started reading before kindergarten. I could write but it was sloppy as the motor skills were lacking. I have some art I did back then that had my writing on it at that age. In kindergarten the other kids figured out I could read. They asked me what does it say a lot.

Anyway my sisters taught me the alphabet,than how to read very young .

I attribute my being able to read so well to my sisters teaching me stuff.
Our house was big on books. We even had world book encylopedias
I got lots of joy reading those.

As for kids poor or middle class if thier siblings or an adult does not take time to teach them and make them curious they might have less interest in reading and learning stuff
They have a harder time of it.