What is the song ticket to heaven by 3 doors down about?

The character in this song feels like after something big has happened to him that it doesn't really matter because when everything is "all said and done" he will only have his "ticket to heaven" and he feels like he wasted his life. It is a common theme that people wonder what will happen near the end of their life and that they think about how everyone dies but merely gets a "ticket to heaven"