You never know who's watching
One of the people who has had the biggest impact of my life doesn't know I exist. I've never met them, or seen them in the flesh.
Dr. Sylvia Earle has spent her entire life trying to understand and protect our oceans. Her life's work inspired a documentary called Mission Blue which I watched back in 2015, just after I started to scuba dive. The next day I became a vegetarian and my life was set on a new course, one living a little closer to my values. A few years later I'd meet my wife Mia because of this decision.
Whatever you do in your life, you will have an influence on others, in ways that you might not expect, or know about. Be the best that you can be, and put that out into the world. You never know who's watching.