Congrats, on the change in life! I worried the same as you when I first started, not picking up things as fast as others or not keeping up (I do not have the best coronation and I'm also very competitive), but it does come and an soon you will be right up there with the rest of the class, so do not worry about that, it will hold back. You diffently are change your life for the better so stay with it, it will come. Also take notes after class when everything is still fresh in your mind, that could help you to remember. That is what I do to remember jabanesse words for techniques. and practicing at home will help to honestly.