Hi Steph,
First of all, congratulations on taking these first steps. There is nothing to be afraid of. Your "old me" will not disappear any more than the first chapter of a book disappears when you read the last. It is all part of your story. It's how you got to where you are now.
People can get used to anything - deprivation, abuse, longing - because that's what we do to survive. But when the cage to your prison door opens, you should think of what you are gaining, not what you are leaving behind. The fact that you are already presenting as female in public should make it that much easier.
You will be fine. You will be better than fine. You will blossom.
With kindness,
Terri