Who are you?

This was the earliest question I remember our Forum Leader asked. A simple question: Who are you?

Are you your body? This meat bag? What if you lose a hand? Will you be a little less of you? No? Then who are you?
Are your your thoughts? What if someone puts a gun to your head? Your thoughts will change immediately. But you won't. Then who are you?

You are not your body. You have a body.
You are not your thoughts. You have thoughts.
Does 'I' really die? Or is it just the body?

I had read concept before Landmark. I had partially understood it then. I am still trying to grip it. But the concept in itself is very powerful. For if you know the real you, would you ever let the act play? Would there be any misery then? Nisargadatta Maharaj and a few more like him claim to have achieved enlightenment even, just pondering on the question: "Who am I?".