I'm really glad to hear you made this big step!
After doing this for years I completely lost my identity in others.
My guess is that you didn't lose your identity, but rather that you were never allowed to have one in the first place. We, as AC's, have difficulty setting boundaries because we'd never been allowed to have them in the first place.
Perhaps that's just my own issues talking, but it does seem to be a common thread that the environment ACoAs grow up in tends to be completely lacking in boundaries. If you've never seen one in your life, how can you hope to make one?
I'm glad that you're able to see where you may still be lacking in boundaries now, hopefully you'll be better at finding a way to set them and make them stick!