Are my going to grow any more?

You should be asking your mother this question. Unfortunately those sorts of things are hereditary and the one who will know best is your mom. Some girls keep growing until age 24, and possibly older, but I don't know your body, and no one else does. It's possible. Maybe you can talk to your doctor about what you can do to exercise your back muscles to make it easier. You're still very young, your may be big now, but after you get older, have a kid or two, and they will get smaller. Don't take that as, have kids now to shrink them! :) That's not a good idea. Just be patient with your body and talk to your mom about it. Good luck and love having a big chest, it can be a blessing in disguise.