After a while I became tired of being told who I was or what I should be like. Furthermore when wearing a mask people think also think you are someone else rather than who you are inside. This has a good side which permits one to hide in a cruel world and pass by unnoticed; I was bullied, rejected, and abused as a child. However, it also has a bad side, in that the real you is hidden and exceptionally alone. It particularly annoyed me when my ex did not accept the real me and tried to change me into a slave; As I am an independent person that did not work very well. So I started to say "I am That which I am", which I shortened to "That which I am", as a statement of individuality and preservation of myself whatever this self was.
I later realized the religious reference to the name of god "YAHWEH" which translates to "I am that which I am" or I am that which is". This was an odd coincidence, stranger still considering I am an agnostic-atheist
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I am that which I am