Its good to question some things but what you are saying is like saying "whats the meaning of life?"When in fact there is no meaning. You just live here ,while you are here, and do the best you can. Wether that means you invent the atomic bomb or you have 3 kids or you volunteer to help the needy. Just live life to the fullest and enjoy the time you are here,and you will come even closer to the answers.