Changed?

When you become a mother, do you change?  Does the essence of your self change?

I know that I feel different.  I feel that the core of my true self has been altered.  It is neither bad nor good, just different.  My moment to moment has changed and my focus has changed, but that's all temporary.  This other difference feels permanent.  Like the secret ingredient of mother was added to my Shelley and created something new.

So my question is, does becoming a mother change you?  Or, is it just me?