You seem very clear on the fact that you don’t regret either getting married or spending so much on the day, so who do you feel the need to justify it to, the world or yourself? It would be too easy to blame it on society, since many people don’t make the same choice. It sounds like you would have liked to be the kind of person who didn’t enjoy these things. But you do! So if you truly know your reasons, as you seem to, then enjoy the memory of the day fully for what it was, and don’t doubt its worth. Instead, why not think about what you can do in your everyday life to achieve something you deem genuinely worthy but that benefits other people?