I feel like when young people think they want to do significant and meaningful things, they think about things that will make them famous in one way or another. Most of such things are neither significant nor meaningful.
I used to think this way, and then I realised that I actually want to be famous and respected. After some time, I realised that I just wanted the approval of people. And finally I realised all I wanted was to feel loved and cared for.
Doesn't matter either way, though, once you realize you're just a blip like the other 8,000,000,000 people on this earth.