It is easy to keep on thinking what one thinks and doing what one does, even if that makes for suffering. However, you can change your mind to overcome obstacles and reach optimal performance.
Some people think, "That's just the way I am." They repeat the same unskillful behaviors because they believe they have no choice. They adhere to mental models without realizing that these models influence behavior and can be changed.
A mental model is a set of beliefs about how things work. Like all beliefs mental models are learned, formed by experiences. The models become deeply embedded so that they may become unconscious.