In striving to learn new things one may encounter learning experiences in the form of failed attempts and setbacks. This is a natural occurrence as all achievements were first met with many unsuccessful attempts. In handling disappointment one must resist the temptation to internalize the experience.
You are separate from the circumstances which befall you. To truly understand this division enables one to withstand the growing pangs of growth and knowledge acquisition. One's worth as a person is not attached to an outcome, but rather to internal attributes.