No, they are not too big- every woman on the planet earth is unique and will have a different chest size. We come in all shapes and sizes so there is no such thing as "too big"- there is just you, unique and individual! If your chest size is making you uncomfortable for any reason- find a trusted adult you can talk to about it, and just remember- you don't have to be like everyone else, you are unique and that's perfect. :)