The only moment that really exists is now—even tomorrow or yesterday are just thoughts in the current moment. So, nothing exists outside of right now. You're not necessarily going to be around for any appreciable period of time. Everything you do will be forgotten, like everything in the past has been forgotten, It's not to say it's meaningless, but it's more to say that you create your own meaning; you interpret your own meaning; you are the meaning of your own life.