Which of the three types of people do you belong to?
There are people who watch what happens. Then there are people who make things happen. Finally, there are the folks who wonder what happened. Your happiness depends on knowing to which group you belong and whether or not you are content with that choice.
There is no wrong or right here. There are too many life situations in which all three choices may have merit. In a relationship with your significant other and at work you may want to be with the folks who make things happen. Being with the other two groups of people will most likely end up with long term problems.
Have you given thought to how to make things happen? The day that you start making a difference will be the turning point for the better. Taking an active role in shaping your life is a potent antidepressant as well as a huge career advancer. Every ever so little step forward will lead to a sense of accomplishment and thus happiness. Ready to give it a try?