Psychologists say that some people possess an internal locus of control, where they rely primarily on themselves for the gains and losses in their lives. Others possess an external locus of control, where they blame others when something goes wrong. Which group is more successful? The group that takes personal responsibility. Which people are more content? The ones who take personal responsibility. Which people learn from their mistakes and keep growing and improving? The people who take responsibility.
Taking responsibility for your life is a choice. That doesn't mean you believe you are in control of everything in your life. That's not humanly possible. But you can take responsibility for yourself and every choice you have.