Hi John
I revised this a few months ago and just realised that I never posted the updated version here.
The changes I made I think are more likely than I had in the original and think it's a bit stronger now 
Here it is...
You gave me away and set yourself free
Bet you justified it as, a better life for me
Were too young to start changing nappies
Your sacrifice would make someone happy
Did the long nine months of carrying me..
Disrupt your plans? The fruit of his seed..
Your biggest mistake
Your worst regret
Your guarded secret
That you’ve kept
Wish I could
See you today
And ask you why
You threw me away
Spent my childhood in various foster homes
I died a thousand deaths from abuse alone
You made me lose my heritage my identity
Not knowing my true name, kept from me
Every day I endured the shame and pain
The life of an orphan has no love to gain
Your biggest mistake
Your worst regret
Your guarded secret
That you’ve kept
Wish I could
See you today
And ask you why
You threw me away
So Mama the next time you wonder how I am
Know you thinking Silver spoon laden with jam
I’ll bet this news doesn’t fit well with your plans
Homeless drunk, can’t remember when it began
And I’m living in hell, doing the best that I can
But hey, why should I think you’d give a damn
Your biggest mistake
Your worst regret
Your guarded secret
That you’ve kept
Wish I could
See you today
And ask you why
You threw me away