Why doesn't finding my purpose make me feel fulfilled?

People often see their lives, and we are all tempted to this, obviously myself included, we are all tempted to see ourselves and our lives in a kind of self-referential manner, meaning we constantly are thinking about what is good for me. Am I being taken care of? Am I taking care of my own self? Are people neglecting me? Are my needs being missed? This is often a conversation in marriage, especially when you have a heavy workload, which is both husband and wife, and they feel tired and exhausted and all these different things, and they constantly are asking each other, hey, am I getting my needs met, am I being taken care of? It's interesting, because we find in the holy scriptures, whether it be with the Mother of God, or Saint Paul on his journeys, the apostles in their martyrdom, the Lord Jesus Christ himself, that there is forever this dual aspect of being a Christian. Number one, that the life of a Christian is one of servitude. It is not about us. It is not about us finding our fulfillment in life. People often say, oh, I want to find what my calling is, or what my purpose is, or I want to find my vocation. And a lot of times, not all the time, but a lot of times, people think about this in a very self-referential, you could almost say narcissistic way, where they are consumed by the idea that they are going to find something to do that is somehow going to mystically fulfill and satisfy them. And quite frankly, we may find a job that we like doing, there may be things that we enjoy about life, but nothing really fulfills us like the presence of God in our souls. This is what we were created for. In fact, when we have the grace of God dwelling in us, what we're doing in our day-to-day life becomes very secondary. It loses a lot of its importance.