Is the world going to end?
Is the world going to end? You betcha. Should you be worried? Heck no.
The world will someday die because our sun is a G type, Population one star. It provides heat and light radiant energy to our planet. This provides habitable zones for climates that are suitable for life. Not just human life, but all species of plants and animals. Too hot or too cold, and liquid water could not condense, and hence no life (as we know it) would form. Photosynthesis needs this energy.
At some point the star we call Sol will gradually change. As it does, life will adapt. Some species will die. Our species will certainly die at some point because of this.
Should you be worried about a sudden change in our Sun? Nope.
Are you going to die? Yep. We're not immortals, not in this current body. This topic is not about being overly concerned with our own survival as an individual. This topic is about helping a community (your personal tribe) to survive, however you define that.
Life may form in unique ways on other planets. Who knows? Maybe new lifeforms will be created as they have on those planets that are remarkable different than ours. It may be that humankind is a short lived species on planets as they change due to the changing radiation from stars and their position in a solar system.
Think past shallow ideas like, “Man, got to learn survival techniques cause I'm doomed from _____.” I have zero interest in that kind of response. It's partially why I left GLP once.
Seldom in history did people live long-term using that kind of reaction. That way of thinking is so gloomy. Why not just crawl into a garbage can, and save your family a lot of trouble with attempting to feed, raise, educate, find a job, and bury you?
Have a rich, diverse experience of living life to the fullest like your ancestors did. They obviously were thinking about more than survival. They might have been selfish to your way of thinking, but as a group they were attempting to offer you better experiences that they had, and wanting you to have more opportunities.
Those ancestors were studying science, finding practical use for it (technology), then creating art, which often was of a utilitarian form that increased the beauty of the practical items they fashioned. Much of this topic is about that subject.
Your ancestors were learning ways to live in a community, otherwise they were hermits and therefore could perpetuate the species and died. Many survivalists are hermits. 'Nothing wrong with being solitary, but there's good looking people to meet and romance, and goodhearted people to make friends with.
It seems to me that being a hermit helps no one really. There's benefits to living alone. It's doubtful that most wives will want that kind of life. No children will. Eventually they'll want a spouse of their own, won't they?
You do look, my son, in a moved sort,
As if you were dismay'd: be cheerful, sir.
Our revels now are ended. These our actors,
As I foretold you, were all spirits and
Are melted into air, into thin air:
And, like the baseless fabric of this vision,
The cloud-capp'd towers, the gorgeous palaces,
The solemn temples, the great globe itself,
Ye all which it inherit, shall dissolve
And, like this insubstantial pageant faded,
Leave not a rack behind. We are such stuff
As dreams are made on, and our little life
Is rounded with a sleep. Sir, I am vex'd;
Bear with my weakness; my, brain is troubled:
Be not disturb'd with my infirmity:
If you be pleased, retire into my cell
And there repose: a turn or two I'll walk,
To still my beating mind.
The Tempest Act 4 Scene 1 William Shakespeare