As God the Son, Jesus knows God the Father unlike anyone else. Possible meanings are 1) Jesus was identifying himself as Yahweh by saying, "I am God" or 2) Jesus was saying, "I am the one I claim to be."
"I am only saying what my Father taught me to say." The word "Father" is an important title for God. (See: [[rc://en/ta/man/translate/guidelines-sonofgodprinciples]])