Associating happiness in life with having a purpose is the fundamental error. The truth is that most people who crave to find the "meaning of life" or who want to find out their special purpose even after having a nice comfortable life, just have a lot of time on their hands. My philosophy teacher once told us that when she was in college herself, she would think a lot about the meaning of this universe and why we are here, but now she's more focused on completing her syllabus in the stipulated number of lectures and grading papers.

Wondering about what our purpose is so flawed. There does not even have to be ONE specific purpose. Doing what makes us happy is enough. It doesn't have to be BECAUSE it's our so-called purpose. It just has to be.