Imagine, lack of Self-awareness

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Self-awareness is the ability to perceive one's own existence,
including one's own traits, feelings and behaviors.
In an  *epistemological sense, self-awareness is a personal
understanding of the very core of one's own identity.
It is the basis for many other human traits, such as
accountability and consciousness, and as such is often the
subject of debate among philosophers.
Self-awareness can be perceived as a trait that people
possess to varying degrees beyond the most basic
sentience that defines human awareness.
This trait is one that is normally taken for granted,
resulting in a general ignorance of one's self that
manifests as odd contradictory behavior.
This ignorance of one's own self is viewed in
existentialism and Zen Buddhism as the source of much
human suffering, as noted by the famous saying from
Zen Buddhism "we are each the source of our own suffering."

http://en.wikipedia.org/wiki/Self-awareness

* epistemological
The branch of philosophy that studies the nature of knowledge, its

presuppositions and foundations, and its extent and validity.