You should get into stoicism, in todays depressive and meaningless society it can give you exactly the calmness you need. When you stop worrying, you can focus on enjoying.
We grew up in a completely different world, and the media gives a completely wrong picture of what is really going on the world. We live in an old world, the world has changed drastically in a short time.
That gapminder site was made by Hans Rosling https://en.wikipedia.org/wiki/Hans_Rosling and is his legacy to this world.
He made (R.I.P.) very good and simple videos about the subject of population, some found on that site, but there's also some on Youtube, give them a watch:
"Hans Rosling's 200 Countries, 200 Years, 4 Minutes - The Joy of Stats - BBC Four"
"Why the world population won’t exceed 11 billion | Hans Rosling | TGS.ORG"
"How not to be ignorant about the world | Hans and Ola Rosling"
Next, here https://www.gapminder.org/tools/ you get to play around with the same information and tools as you wish, give it a try