You decide every moment of every day who you are and what you believe in. You get a second chance, every second.
Think about it, every moment of every day that you are alive, you are able to decide if what is really in your heart is true, and if you are living in the way in which you know your heart wants you to live. Are you living as yourself today? Are you living as the person who you know is really deep down inside of you, or are your living your life to satisfy the people around you?