I invite you to measure life from the point of view of your improvement as a dancer.
Take an arbitrary segment of time, that can be either objectively or subjectively determined: the last twelve months for the first approach; the last time you saw a particular person for the second approach, for example.
Now ask yourself the following question: Did I improve my dance?
And: Have others improved their dance?
You won’t know about those lost from sight. You may be able to infer from the little information getting to you from unsolicited sources. Sometimes at the reencounter the fact that you improved your dance makes that person instantaneously become a better dancer, sometimes your desire of their improvement as dancer makes them dance better; sometimes the seeds that you’re seeking of improvement planted in them last time you saw them have started to sprout.
Avoid comparison, being inefficient, lacking elegance. But when unavoidable, realize that the best thing about mediocrity is to show you an example of what you do not want to be.