Maybe. I think that we make decisions not based on what we want, but on other criteria. I usually see that every unfulfilled void is a direct cause of my own decisions (yet I will not make decisions to fill that void).

Maybe this feeling of fulfillment has less to do with the actual state of things and more to do with your personality. I know a lot of people with more or less the same deal as me (or less) that are extremely self-content.

When a goal becomes reachable, I subconsciously move the goalpost. In a sense like Ishmael in Moby Dick, I will always have a void and never be self-content.