to your very good pointings:
First I read your questions and did not see the sentence above, that later was read, so:
Write the word "I" on a piece of paper. Look at the word, is that YOU?
No, that is definitely not me.
Speak the word “I” silently; be aware of any sensations or responses to this word. Are any of these reactions in your body or mind by themselves YOU?
There are sensations like in the chest, throat, head, belly, arms: no me.
Now say the word “I” aloud. Is that sound YOU?
The sensations are stronger, the sound is familiar and seem to belong to a "me". But sound vibrations in the body are no "me".
Is the combination of any of these, the word, the sound, the thought YOU?”
The combination brings a bundle of sensations that seem to constitute a "me" - but every one on its own shows no "me".
Is the thought, "I exist" you?
No, it´s not. It still is a thought.
Is the thought "I" you?
This thought brings a vibration mostly in the chest that is familiar to "be" a "me". But is has no "me" in it.
Then I read the text above your questions and that changed something:
You qouted the sentence of mine: "There is the feeling of existing..."
Could this "feeling" actually be a thought?
Yes it is.
It was felt that a feeling has two (?) aspects: one is a pure sensation, the other one is a thought that claims something.
Here the feeling of "someone existing" has a sensation - that is simmilar to the sensation of the "I" thought - but the aspect that seems to relate or refer to a "me" is simply a thought. And this thought has no own life of itself, it "provides" a false assumtion - which is made of thoughts itself.
There was a brief experiencing that there is nobody and that there cannot be somebody.
The sensation of the "I" thought stands on its own and the seemingly attached thought that "there is a someone" is just a tought - nothing else.
For a short moment there was no personality there, an empty space, I did not exist - still perceiving. That was weird.
Up to now I took the feeling of existence for real - but even that is not real.
Thank you !