The work by Abraham Zaleznik at Harvard proved that the way you respond to disappointment is usually an accurate predictor of how likely you are to achieve great success. If you respond to disappointment by learning the very most from it and then by putting it behind and processing forward, you are very likely to accomplish great things in the course of life.
N:B: Everyone faces difficulties every step of the way. The difference between high achievers and low achievers is simply that high achievers utilize adversity and struggles for growth, while low achievers allow difficulties and adversity to overwhelm them and leave them discouraged and dejected.
So today, choose to face difficulties with a positive attitude and bounce back from disappointment.