The true self

You are not acting from your true self
when you are drunk or stoned,

stressed out, depressed
or possessed by a crazy idea...

Are you yourself 
when you're on antidepressant medication?
What do you think?

Who are you really?
Maybe you are not the one you think you are.
Maybe you are someone else.
Maybe you are a bunch of people.

Is the true self an illusion, as the Buddhists say

or is it the eternal core of your being as the Hindus say?
Is it the part of you that goes to heaven or hell when you die?

Is it just brain chemistry?
Is it just an idea, a thought?

What do you think?