Well, if you can accept the idea that your life will mean nothing in the long run more power to you. But that is the reality that you face. Anyone who believes that somehow they can overcome entropy does not know the true meaning of the universe.
Do you honestly believe that if there is no God that life has a purpose? Exactly what would that be? In sixty years or so, you will die. The generation after that, well they will die as well. The third generation? Dead. Forth? Gone. Fifth. Dead, rotted, and decayed. In fact on the grand scheme of things you already have decayed. Your mind simply has not caught up with time to the reality. That is not a mobid view. THAT IS REALITY. A fact to face. The practical view.
Suppose for a moment that you benefit people in some way you come up with a marvalous cure for cancer. What does it matter? You've only posponed the inevitable as the person or persons will die from something else. Death cannot be avoided. It cannot be cured and it cannot be barganed with.
So if you wish to avoid that reality that awaits you and your loved ones then by all means. But one things is clear.
If there is no God then you will lose all that you love and there is not a single thing you can do to stop it. Ever. All of your loved ones are dead and decayed alread and you will have to look upon their graves and weep for the loss that you can never recover from. All of humanity will have to accept this sooner or later. It cannot be avoided.
If you feel that this is morbid view then perhaps you should take a trip to the local cemetary and tell me why I am wrong. Again that is reality.
This is the fate for humans if there is no God. Any other view is delusional. Again if you do not believe that, take a trip to a graveyard.