"what does it feel like to be blind from birth?" can you, a sighted person near-sighted though you may be for this example, even/ever comprehend it no matter how extensively described. can someone who has never seen actually describe it to you?
I am saying that it is not possible. It is entirely possible that you can "see" but not comprehend anything, hence effectively being blind. Is my red your red? Is my hotness your hotness? Is the universe upside down? Is your 3d the same as my 3d? Even all of this imaginations and hypothesis is coming purely from my sense of experience.
I don't even know that you exist, you might simply be a figment of reality, there could be nothing behind this post. I wouldn't know.
>"I" here implies a center of thinking. There is no center.
"I think", according to you, implies that I implies a center of thinking, and you don't believe that there is a center, so you don't believe "I think" even more than you don't believe "therefore I am". You don't have an opinion about therefore I am.
it doesn't matter about the "existence" in the predicate, because you don't accept the "I" in the subject.
I suppose it's because people associate so much of who they are to the subjectivity of their experience. If I'm not the only one to see and taste the world as I do, am I even special? (The answer is no, and that there are more important things in life than being special.)