“My genes” are carried by a really large number of people. It’s pretty much guaranteed many will reproduce.
I die because nature has selected humans to have a certain lifespan.
In many species, almost no individuals reproduce. Worker ants never have children. Same with worker bees. Plenty of species select have some/most members not reproduce to protect assist species.
Ants are not mammals so procreation and societal structure is very different from humans. Same in bees etc.
From evolutionary perspective, only your genes are „your“ genes. And from tribal perspective, procreation of each (quality) member is for the better.
P.S. At some points in human history we had a similar only-chosen-procreate tendency. But it was overturned. I'd argue that for the better. Humans who have a stake in the future seem to care more about the society. Compared to ants-like society where warlord procreates and the rest of men just guards his harem.
To repeat what I just told you: It eventually gets rid if you no matter what you do. (And no matter which subset of your genes you have incoherently decided to personally identify with.) And then none of it matters.
That's a very simplistic view of one as an individual. Which IMO is very wrong and a big problem in today's West.
A human being is a continuous process both genetically and culturally. Your forefathers form who you are and you form people who will live long after you.
Individuality's got nothing to do with it. Identify with some nebulous collective like your genes, your culture or your nation if you wish. They haven't got eternity in them either. They will all die too, it'll just take a little longer. And then it won't matter for anyone.
There should be things which matter for their own sake, here and now, no matter what happens in the future. I can promise you that if you don't find them now, you won't find anything that matters in the future either.
Nature doesn't judge you, it just gets rid of you.