You're probably right on all the other comments, but to say that "the entire history of philosophy is to figure out the answer to this problem" is bad.
Real philosophers, like those who lived from Socrates until Descartes, care too little to this question to even mention it, as the answer is given from the start.
Are you saying everyone who called themselves philosophers after Decartes is fake? And I wouldn't just call someone "wrong" when it's obvious that you're making an opinion. As for the "real philosophers" thinking about this, learn more here https://en.wikipedia.org/wiki/Philosophy_of_self
When I say "like those who..." I mean that all these were real philosophers, after Descartes that is not a rule anymore.
I would say that the real rule today is: everyone who publishes in philosophy magazines or has a chair in some philosophy department on some university is NOT a philosopher, all the others are.
As you can see from that Wikipedia article, the theme is totally ignored by philosophers. Wikipedia makes a huge effort to make a full article for it, but only achieves a small text full of sparse references to unrelated topics (self-knowledge, which is clearly not the same thing as we are talking about here; and various superficial silly comments from post-Descartes people).
Real philosophers, like those who lived from Socrates until Descartes, care too little to this question to even mention it, as the answer is given from the start.