Well, I think I recall him saying on one presentation or other that he was bullied at school at one point - I may be wrong. He also has often said he only has good sight on one eye. This then could well be an example of guy driven to succeed in adult life and that desire driven by those childhood memories. Somebody who has made the best of themselves physically to their standards, and alongside that, has become a well-paid provider/hunter gatherer for his family.
Speaking personally, and I'm sure others on here will know from their own feelings - what happens to you in your childhood years stays with you – good or bad. We are essentially the products of those childhood experiences. I am sure he is no different. And if he was indeed bullied, that low self-esteem bullying brings to you, often remains lingering beneath the self-confident persona one develops to counteract it as you get older.