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 that people have to go through physically and spiritually trying to make a living, etc. etc. The whole vitality of body and soul depend on being happy. It is a great mitzva to be happy at all times. Be determined to keep away from depression and aim to be happy constantly.
Happiness is the remedy for all kinds of diseases because many illnesses are caused by depression.
You must be resourceful in order to make yourself happy. If you really set your mind to it, you will easily find that even amidst the worst troubles and suffering there is an opening which you can use to convert all the depression into joy. When someone is happy all day it is easier for him to spend an hour or so with a broken heart, talking to God and pouring out his heart like water before Him. After a broken heart comes joy. This is the source of all that is good and all joys.