You are not one.
You are in fact a group of I's that assume the role of you at each moment.
Some stay for a bit while other's come and go.
A singular body and seamless connection between each I gives you the impression of oneness.
But there have been glitches...
“Jesus asked him, “What is your name?”
He replied, “My name is Legion, for we are many.”
– Mark 5:9
“Happy are those who have overcome their egos.”
– Gautama Buddha