"I" may well be the most misunderstood word in the English language. That’s because when we use that word, we are most commonly using it to point to something that’s not real, that’s not actually who we are!
It is possible (and desirable) to separate the Ego from the one who identifies that Ego as belonging to him/her. And unless we make real for ourselves that the Ego is invented by us, and it is distinct from who we really are, we will commonly refer to that Ego, that aspect of our personality, as “I”.