I prefer to think that I allow my own happiness, rather than that I create it. I think happiness just happens by itself if we will only get out of the way and allow it.
This reframes the concept of effort, which really can get in the way of happiness. Effort is okay, however. Some is needed. But, for most folks I know, there is a need to stop trying so hard to be happy -- and just to allow it to unfold and bloom in their lives.
It's up to you to find your own way that works, but be cautious toward that part of yourself that would like to bring happiness into your life by effort, I'd say. Effort is always toward something, but happiness only lives and grows in the already present moment. Why strive after it if it is already present? And if it isn't present? You're not present. Arrive!