Shaquille O'Neal is one of the most famous men in America and has four NBA championship rings, but growing up he often questioned his own abilities on the basketball court.
The 7'1" center, known by most as "Shaq," says he would come to the bench frustrated during some games, unable to score with multiple people guarding him.
"I had to learn at an early age to turn criticism into motivation," the 15-time NBA All-Star tells CNBC.
O'Neal says his strong support system was a key driver in his success. His stepfather, Army Sergeant Phil Harrison, and his uncles would say, "Find a way to get it done!"
"I was taught and raised to never give up, always persevere and no excuses," O'Neal says.