Identity Crisis

Simple interview.  I’ll be the victim.
Question:  What is your identity?
I’m Corrie.
-That’s your name.
I’m Female.
-That’s your gender.
I’m single.
-That’s your marital status.
I’m a dance teacher.
-That’s your job.
I’m American.
-That’s your nationality.
I’m adventurous.
-That’s your personality.
I’m a human being.
-That’s your species.
I’m frustrated.
-That’s your current emotional state.
I’m leaving now.
-That’s your choice.
Hmmm.  So let me get back to you on that…
Maybe Wikipedia can help me solve this!
“The identity is "a subjective sense as well as an observable quality of personal sameness and continuity, paired with some belief in the sameness and continuity of some shared world image. As a quality of unself-conscious living, this can be gloriously obvious in a young person who has found himself as he has found his communality. In him we see emerge a unique unification of what is irreversibly given--that is, body type and temperament, giftedness and vulnerability, infantile models and acquired ideals--with the open choices provided in available roles, occupational possibilities, values offered, mentors met, friendships made, and first sexual encounters." (Erikson, 1970.)”
Is it really so complex?  What’s this definition trying to say anyway?  If it’s a culmination of experiences, then can I not develop a true identity until I’ve lived long enough to accumulate enough experiences from which to define myself? 
Identity is a definition of self.  There are a lot of things in life that are out of our control.  Our identity is not.  It comes down to the source we evaluate ourselves against.
Why does it matter?  Well, it colors everything that we do as an overarching umbrella over our life path and perspective.  At the end of your life (the timetable of which you do not control), your identity may be deduced by examining your choices.  What you believe about yourself (or your identity) fuels those choices.
If I believe that my identity is, say, a banker, then I will naturally shape my life choices around fulfilling that identity.
Oops…then the identity I have chosen is something I DO not who I AM.  When I am laid off due to cutbacks out of my control, then what?  Has my identity shattered until I can find another banking job?  What if I choose to DO something different at age 30 – am I automatically having an identity crisis because of a lack of historical continuity?
There is no way to accurately define who I am without identifying and defining my life purpose.  Begin with the end in mind.  That life purpose must be large enough to encompass more than just what I do, my failures, my successes, where I currently live, my hobbies, my talents and my experiences to stay consistent.
According to Wikipedia again:
An identity crisis is when an individual loses a sense of personal sameness and historical continuity.
Sameness and historical continuity based on what?  
-How about the truth - which does not change – ever.