Happiness is not something that comes naturally or just happens. At least not for me. I have to make a conscious effort to make happiness a part of my daily life. Being happy is a choice just like being angry, upset, or sad is a choice. You have to choose happy over choosing to be angry, upset or sad.
I have to sometimes will or force myself into a state of happiness. It just doesn’t come as naturally to me as it does to others. When I find myself not choosing happiness I try and find at least 3 things that make me happy or put me in a state of euphoria and focus on them until I’m able to freely choose to be happy. The key is in the choice. If you have to choose, always choose happy and pursue it like your life depends on it.