newsflash: when you die, you die, that's all.
If you dont have kids sharing parts of your DNA surviving after your death, you basically somewhat entirely disapear. If youd idnt talk, teach anything to anyone, your thoughts and values dont survive either, you dont even stay into someone's mind after your death. You can only exist after your death by transmiting your dna or values, advices etc to some people you knew before dying.
Well, in fact you feed worms and keep "existing" as disipating gas or matter when you think about it. But your mind only keeps existing in your children if you have any.
What is the closest thing to being immortal? having kids and grandkids. We still havent done much better.