The Chicken or the Egg

So as I sit here watching The Dark Knight Rises, i think to myself...Why do we do what we do..as bodybuilders...or really why do I do this.  I love training til i see spots and I cant breath...and yes I feel much better when i eat clean, but in the end of the day why.  Do i do this because I am am active competitive bodybuilder, or do I compete because i already do that.  Its kind of a hard question to ask, but i feel its important. I feel these are the questions we need to ask ourselves to get a better understanding of why we do anything.