How did you already manage to come up with a concept of “self”?
I’m over here thinking, if I did exist, what would this “I” be? This physical body? Brain? Some ephemeral soul that scientists (if those are real) can’t seem to measure in any way. Some hidden variables on another dimension underlying this thing we call reality?
There's no point in doubting that you are observing an existence. You are conscious. What I can't resolve is the ship of theseus problem. I have no proof that my consciousness is continuous over days over weeks.