Am I or I am

"Who am I?" is correct if you are asking a direct question.

In indirect speech you might say something like "I wonder who I am."

Miriam
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~comes back to edit~

I forgot you asked "why".
The verb "to be" doesn't use any auxiliaries in the present simple, so in order to make a question you only need to invert the position of the subject and the verb.
In an affirmative sentence, you say:
"I am atm."

In a question, you turn "I am" into "am I", so you have:
"Who am I?" (for a wh-question)
or
"Am I atm?" (for a yes-no question)

Affirmative:
I am
You are
He/she/it is
We/you/they are

Interrogative:
Am I?
Are you?
Is he/she/it?
Are we/you/they?

Hope it helps.

You're welcome, atm.

I've seen those "who we are" pages in many websites. The company is not really asking the reader a question; rather, they are saying "We're going to tell you who we are" or "We're going to tell you something about us" ("Who are we?" would be a direct question).
They are similar to pages such as "where we are", "what we do/offer".
The form, as you said, is that of an indirect question, but you're not really being asked anything.


Miriam

am I not?