Note to self: other people's talents don't take away from your own. Just because a similar story has been told doesn't mean yours doesn't need to be told just as much. Everything is, essentially, the same--carbon, oxygen, hydrogen--hurt, anger, regret, love, joy--yet we accept that we are so fundamentally different and so individually important.
You are different, and your story is an outpouring of you. It's the reason why we can read hundreds of tales of orphans, of princesses, of spell books and spies, and yet we never grow tired. Because there is something different about each story--it's soul. Your soul. That is always worthwhile to read, and always important to write.