Lying awake worrying about whether or not you're adding value to the human race leads to shit like this. What I'm trying to say is: people should just do what they're good at. As long as you make a decent living, you're contributing to society. What is, let's say, a cleaning lady or bus driver supposed to think of your "value for the human race" criterion?
Having long term impact that is noticeable is good and should be everyone's goal. But being this confused about value is what leads to shit like this.