I have a nagging thought in the middle of my head that slaps the insides of my brain around trying to get my attention. It's saying "You don't have as much time as you think"!

I'm trying to discern if this is a message or just a thought based on who knows what kind of insecurities about life in general that I might have. The question is: Is it true? If so, it's the perfect rationalization to continue bouncing off into what ever adventure I dream up next.