There may be times when the only way to make yourself happy is by doing something silly or making jokes. There are so many troubles people have to go through physically and spiritually (trying to make a living, and so on), that in many cases the only way they can make themselves happy is by doing something silly and acting a bit meshuga.
The whole vitality of the body and soul depend on being happy.
—Rebbe Nachman of Breslov
It is important to be honest about your flaws, but it is even more important to recognize and pay attention to your good points. Even if you have to send out a search party to find your good points, do it.
Seek and identify all the good deeds, kind acts, faith and belief, talents, and other fine attributes you possess. These reflect your TRUE self. Name them and say them aloud. Write them down.
The Rebbe teaches that we are where are thoughts are. If your thoughts are on your best possible self, your past good deeds and your highest potential, that becomes your reality.