My friend you are talking about the long run. Yes in the spectrum of existence, everything we do doesn't mean jack. Out whole life is insignificant. Even the whole earth is insignificant.

But my friend, we have to be practical and focus on the present because that's what you have and you're the living proof. Each day, you get hungry you need to eat. Each day you get cold you need clothes. You need a place to sleep, you have needs. Your body has needs and you feel the retribution if you don't fulfil it.

In the long run it doesn't mean anything, but right now what you have is your present and present in another word is a gift. You have gift of life and you should try to enjoy and make the best out of it while you have it. After all that's all you have. It's a one shot chance to make the best out of it. Try to make it a good experience my friend.

Your argument about the long run can come in handy if you meet with any failures or negative experiences. You shouldn't let negative things bother you too much because after all nothing's permanent.