I understand where you are coming from, we are all mortal, thats what everything on earth has in common. We do all have limited time on this planet, accept it. we are all insignificant even on a global scale nevermind a universal scale, but we are significant to those close to us. Develop that significance, bring up children if you can, be a great influence on them and they will remember you forever.
Never dwell on things that have past, look to your now and build the future you desire ,
best wishes and good luck!
Nixon Chan :)