Have I lived my life in vain? Can't answer my own question. But I do have a feeling that I eventually will feel that way. How many people can die and leave this world feeling like they are satisfied with their life? They will still have alot of regrets and still feel like they have many things not done or could have done better. So what if your existence might have made someone very happy? So what if your actions might have made someone very happy? So what if you think you had made significant contributions to the society and the world? Especially if your contributions are academic. All ideas will eventually be rebutted by other theories and debated over. Worse still, if you were not the one to come out with that idea, someone else WILL come out with that idea. You are actually very insignificant.