Self-improvement is a thing which you must practice throughout your life because once you started to believe that you are perfect then, things will start to become complex. You need to know that no one is perfect and no one can be perfect.  
 
There is always room for some improvements whether it is in your personality, in your health, in your fitness or in any other thing but you should keep trying for the better state. There are hundreds of therapies which help you to get rid of all kinds of mental stress and once you are relieved mentally then, you can always feel better in every part of your life.