>Somebody once told me the world is gonna roll me
>I ain't the sharpest tool in the shed
The "Roll" in the first line is referring to the Hereclitean notion of flux, of course our protagonist will change, as it could not be any other way.
>She was looking kind of dumb
The key word in the line is "Looking". The protagonist restrains himself from saying she WAS dumb, but only that she looked it, from his own perspective, and interpretation. The rest of the lines following this are mostly unimportant details.
>Well, the years start coming and they don't stop coming
Eternal return. The protagonist has embraced it, signifying himself as an extraordinary individual.
>fed to the rules and I hit the ground running
Existing within modern America, our protagonist has been "fed" to the rules of the modern democratic machine, and has been subjected to the rule of the rabble for far too long. He has made the decision to live his life dangerously, and to own himself in spite of what the commoners might think of him.
>didn't make sense not to live for fun
The "Sense" here is obviously referring to "reason" in the Apollonian sense, whilst the "Fun" is quite clearly that of Dionysus. This makes reference to the conflict between the two that is prevalent throughout much of Nietzsche's work. Our protagonist has identified both of these wills within himself.
>You brain gets smart but your head gets dumb
Referring to modern Academia, and also to the vulgar positivism that has taken hold of the general populace.
>So much to do / so much to see, etc.
Referring to taking the uncommon roads, and experiencing every facet of life, instead of settling for the dry, boring, and torturous existence of the commoner.
>All that glitters is gold
Relating to the affirmation of life. Anything that "glitters" (anything relating to the world, which is constantly in flux), must be gold by virtue of the fact that it is part of the never ending flux of the universe, and one single element that is affirmative could not exist without the others.
>somebody once asked could I spare some change for gas
Another reference to strife/flux
>We could all use a little change
The protagonist wishes to shake things up
Any other insights on the piece? I've also found it can be interpreted though the ideas of Jungian alchemy, and in fact, that interpretation is perhaps more cohesive.