Who am I?

Suppose, your name is Rohan. Then, obviously everyone will call you by this name. Now, suppose you loose your arms in an accident. You will still be called Rohan. In another accident you loose your legs too. You will still be called Rohan. Consequently, you loose your eyes .Still, you will be called Rohan. If you now loose your head and are somehow alive, you will still be called by the same name.
But, if you possess all and are dead - you are then just a dead body and nothing else. It will be said that Rohan is dead but this body no longer possess a name.
Thus you see when having nothing and still alive-you were called Rohan. But  when dead 'you' possessed no name.(note this you - which is still there even when you are dead.)

So, there exists 'something'  having which 'you were called Rohan'  (you were never Rohan though)
and when this goes away you were striped of this name. This 'something' is your consciousness.
Body is just expression of this consciousness.

But note that the "feeling of I" was there always immaterial of presence body or consciousness. This
feeling of you never changed even for a moment. This is actual you . Consciousness just arises and falls 'in' I which expresses itself through body. I always remains.

The difference between 'living' and 'non-living' is that living 'possess' consciousness while non-living doesn't . But 'I' of both is always there.