Your brain is what processes reality, every part of your body is a tool used to process reality, you are essentially a brain piloting a flesh mech. If this is the case, and reality is this creates by your brain, then death is impossible because death means your brain cannot create the reality around you, if this is the case, then you could not possibly perceive death, because your brain must be alive to create reality.

Hence forth, you are immortal, but all others around you are not, because your brain can perceive the death of others. This is true of all humans, in your reality I can die, in my reality you can die, but in our own reality neither of us can die.