Your "self" is malleable because it's nothing but the summation of mental programming to form beliefs.
Also, your personality is a learned response from programming.
The word personality is synonymous with the word persona which means "mask, character played by an actor" in Latin.
In other words, your personality isn't permanent.
You're living the identity you've chosen — consciously or unconsciously — and it's probably not the one you really want.
Every person suffering with an addiction has a non-addicted identity waiting to surface.
That said, the question "Who am I?" doesn't really matter.
The question that really matters is... "Who am I becoming?"
You are who you think you are.
And you'll become who you decide to become.
So, if you don't like your mask... change it. 
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