In an interview with France Football, he said: "Mourinho the man tries to be the opposite of what the manager is. He tries to be discreet, calm. Find a way to disconnect.
"I can go home and not watch a football game, not think about football. I can do it. At the beginning of my career, I could not. I was constantly connected, 24 hours a day. I had to find a form of maturity.
"Today, I feel good with my personality as a man. I have matured, I am more peaceful. A victory no longer represents the moon, and a defeat hell."
Despite Mourinho's reassurances that he has calmed down, the United boss took a swipe at one of his managerial rivals, Manchester City's Pep Guardiola.
Guardiola endured domestic success in Germany with Bayern Munich, winning three Bundesliga titles, but Mourinho could not help himself as he took the opportunity to aim a subtle dig at the Spanish coach.
He added: "
"Me, I arrive at a club that has a great and prestigious history, but no club in England, whether it's Manchester United, Liverpool, Manchester City, can be dominant permanently. Power has divided."