The question “Who am I?” is used when you question what type of person you are.
“Who I am” is a sentence fragment and is part of a sentence or indirect question. “Do you know who I am?”
More examples of Who am I?
Who am I? Is a question when we reflect about ourselves in self-discovery. In other words, this could be a time in your life when you discover your purpose in life.
We also use this if you are asking your friends which character/team you are when you are playing a game.
(playing Fifa football)
John: Who am I?
Peter: You are Barcelona and I am Real Madrid.
Who I am?
As I said before, Who I am is usually a part of a sentence or indirect question. We change the order of the subject and the verb when we use indirect questions.
Direct question: Who am I?
Indirect question: Do you know who I am?
In this second question, the meaning is different from the first question. In the first question, you are questioning your existence. The second question means that the speaker believes he/she is a person of importance and is surprised that the other person is not aware of this.
I don’t know who I am.
Can you tell me who I am?
If you are introducing yourself in a presentation it is better to use “Who I am”, Then you can explain the person you are and it sounds more confident than “Who am I?”.