ok ill try to help, NO 15 pounds will not work, but your in sixth grade, your probly about 12-13yo, I would think you can pull more than 15pnds, you might could even pull 35-40pounds, you will just have to go to a bow shop and try one out for your self, they will be able to help you more than we can, there are plenty of bows made for people your age, Most shops will have a few there for you to try. Good Luck