Whatever you perceive you are not.
You perceive a body that experiences pleasure and pain.
You are not.
You perceive a mind filled with thoughts, images, and memories.
You are not.
You perceive a world outside full of beings and objects.
You are not.
You perceive the wonders and horrors of humanity and beasts, nature and the universe.
You are not.
You perceive the observer of all these things.
You are not.
If you are not any of the above, what remains?
You.