He who can at all times sacrifice pleasure to duty approaches sublimity.

Setting aside what you want in favour of what you owe is rarer than it sounds. Most people can do it occasionally, under pressure or when observed; doing it at all times, including the small unobserved instances, is close to a different order of character. There is nothing showy about it, which is exactly what makes it impressive when you see it.

Take one obligation you have been avoiding because something more enjoyable was available. Do the obligation first this week, without announcing the sacrifice, and see how the rest of the day feels.