Being confident is the key to success. Without confidence, no one can be successful.
First, adjusting the goal of your life. If your goal is too far to reach, you may have inferiority mentality easily.
Second, having the attitude to let it be. You should pay more attention on the process of your life, and do not put too much pressure on yourself. Try to make the healthy and happy life as the most important thing in your life.
Thirdly, finding out the hidden power of you, and knowing yourself clearly. You should know your advantages and disadvantages, and try to avoid the shortcomings and promote the goodness.
Fourth, insisting on doing suitable exercise. Try to form a regular life and a positive attitude towards life.
Fifth, listening happy and relaxed music lots. And always see health and positive movies, read good books, and learn new informations.