The thoughts, actions and memories that make us who we are, are not very reliable. Feelings and emotions are subject to the present moment.
If we try and recollect a past emotion or memory, we can never quite recollect it. Maybe a momentary flash of the time gone past might have you shift your awareness to another time and space, but you are never really there.
So then, if it is non-tangible, non-existent, non-comprehensible...is it really there ?
If it is not here, then how can it be used to identify you ?
Your awareness and your ideas and your actions are who you really are.
Take a deep breath. What do you feel with that gallon of breath in your lungs ?
I feel calm, restful, alert, strong and fully aware. THAT is who I am.