You should live life to the fullest. Heard that phrase said to you?  

Well, what does that mean? What is the fullest? And when you've reached the fullest, then what?  

You are living a life that's yours. Nobody else in this universe has what you have - your experience. You get to choose how you will live your life. And, you get to define what "fullest" means for you.

Perhaps the advice may be better worded as, "Choose to live your life to your fullest."