I

I think there are a few things that you could do to enhance this piece.

Over all, I think the format could be played around with a little more. Sometimes I felt the lines were too long, and I'd like to see some extra stress on that "I" repetition. Really make it stand out. Maybe something like...

I seethe

just below the surface, it runs under my skin where it cannot be seen.

I burn,

the flames are licking my pores, just waiting to escape to the outer realms.

And so on and so forth. This would break the poem into couplets with the last line still standing on it's own.

Also, two nitpicks. "I am anywhere around" -- I think it might be enough without the "around" only because with it the sentence felt awkward to me. And your ending line, final note: "I am the dirt beneath your feet now." -- I would be tempted to leave off the "now" as the entire write played out like a riddle. I kept wondering where it would lead and end, and it was as if you'd been implying this line all along.

Anyway, just some thoughts.

~Emeya