Does Mercutio believe that an individual rules his own destiny entirley?

Mercutio does not believe that an individual rules his own destiny entirely. He states, "I am fortune's fool (Act 3, Scene 1)." This suggests that Mercutio believes that luck or chance plays a role in a person's life. He also states that "a man's fate lies in his own hands (Act 3, Scene 1)," suggesting that he believes that a person's actions can influence their destiny. However, he does not believe that a person has complete control over their destiny, as he believes that luck or chance can also play a role.