Io

I am I. No one more than me is I. Among other things, I am the only I I know, and the others are the others. I, is the only thing I can say about myself without fear of being contradicted. And yet, for you, I am you, and this slightly undermines the foundations of my certainty. But with this definition, I believe I can put an end to any doubt. From today, the only true I is I, so find yourself another pronoun or otherwise use "Me."