Credibility level, something approaching zero. My elder sister taught me to read when I was three, and I don't believe there's been a moment since when I haven't had at least one book on the go, commonly several. I know there are two schools of thought about this, but I hold with those who maintain that reading is a significant improvement on real life.
Books have better endings.
I do remember getting into serious and painful trouble at about the age of eight, for writing stories in class when I was supposed to be doing other things. These days I party, but I was young then. Primary school was fun, by and large. I moved around, winning scholarships and losing friends, losing the habit of contentment. My parents divorced, I hit adolescence, life was a steaming pit of ordure.