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lets reframe the question eh?

"why do nothing when you're living if you have a whole eternity do it instead?"

Both questions are equally legit. You DONT have to do anything at all with your life. Nature doesn't care, the universe doesn't care.

There is no purpose to life. Well, there is kinda one technically, biologically your purpose is to pass on your DNA and ensure that the Homo Sapiens does not go extinct. maybe that's the only thing nature cares about when it comes to what you should do.

It's all about perspective. Because there is no "greater purpose" in life, Life is exactly what you make it to be. Be it good or bad.

I dont care about what happens to me after i die the same way i didnt care what happened to me before i was born. This lifetime is what i have and you damn right im going to make the best of it with what i have.

We can talk about it more if you are interested in a civil discussion. It's 2.25am now as i type this and my mind isnt exactly sharp.

Great answer. The evolutionary definition is always useful to think about, and I've thought about this question a lot too! I've come to the same conclusions - that we were created and built to survive, and that our existence is most likely at least unknown to us within our ability to know. However, if and when you accept that we exist to survive and to prosper, then it can make life a lot more exciting! There should be pride in living a life aimed at prosperity imo.