What am I doing?

I'm not exactly sure what I'm doing.  I have so much swirling around in my mind and in my emotions.  I used to write with cathartic objectives in mind.  At the very least, I could look back on my writing and learn something about myself or see how far I'd come.  Now, I'm on the brink of turning forty and am painfully aware of the fact that my life could be more than half over.  Like most people, my children are my most impressive accomplishment and though it's a cliche, we all know it to be true.  However, I am painfully aware that I was merely a facilitator in bringing these two amazing souls into fruition here on earth.  They will have their own lives with their own paths and hopefully have the opportunity to be their own true selves.  So now, the question begs "Who am I?"  Other than daughter, sister, wife and mother - what is my purpose?  My mother always told me that I am a strong writer.  I don't know that to be true, but I do know that it is healing for me and that it can sometimes help me see the proverbial "forest for the trees".  She still says I should write, "Write what you know" she says.  And so, I am writing.