99% of people (if not more) do nothing of significant value for the human race. The wealth they create, the value of the product they produce, and the experience they gain all dissipate or become meaningless in the medium to long term. Value for the human race is not a very good criterion to decide whether what you do is bullshit. If you need a purpose in life, get children.
They are painting the murals that brighten the entrances to workplaces across the world, or researching incremental improvements to human knowledge that collectively form the foundation of the next generation of science.
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?