I am a circumstance
— noun
1. a condition, detail, part, or attribute, with respect to time, place, manner,agent, etc., that accompanies, determines, or modifies a fact or event; a modifying or influencing factor
I am a lever*
—noun
1. Mechanics. a rigid bar that pivots about one point and that is used to move an object at a second point by a force applied at a third.
I am water
-noun
1. a transparent, odorless, tasteless liquid, a compound of hydrogen and oxygen, H 2 O, freezing at 32°F or 0°C and boiling at 212°F or 100°C, that in a more or less impure state constitutes rain, oceans, lakes, rivers, etc.: it contains 11.188 percent hydrogen and 88.812 percent oxygen, by weight.
I am you
— pronoun, possessive your or yours, objective you, plural you.
1. the pronoun of the second person singular or plural, used of the person or persons being addressed, in the nominative or objective case
I am all of these things and nothing at all.
*I am.