I am is a defining statement. If one asked an elemental– an iron bar– what it is, the answer would be “I am iron.” It has mass. Cut it in half and it’s still iron, but its mass is different. “I am” is a defining characteristic that is unchanging.
“I am fat” says that you are the elemental nature of fat.
“I am poor” says that you are the elemental nature of poverty.
“I am a web developer” says that you are a mechanism that turns out web pages.
Are you fat? Are you poor? Are you a machine? Are you those elemental states? No: you are not.
“You have fat,” says that you have fat on your body to the extent that is not to your liking.
“You have no money,” or “You have too many debts,” says that your money situation is bad.
“I do web development” says that you know how to use that skill and you use it.
Iron, short of alchemy, cannot change to be a different element. When something is elemental, it cannot change. That isn’t true about health, wealth or outlook. Those are not whole definitions. They are factors– they are levels and traits. Traits can change: they can increase or decrease.
I have spent too long with defining statements that make me into an element. I am not an elemental. I am a person. I have problems. I have goals. I have things to improve. I have challenges.