im 15 and play for girls try loads of different ones and your coaches will find your best one remember they are experts in rugby and will know your strengths and weaknesses probably better than you do. try different things and you'll know which one is for you
Probably Second Rower or inside center.
Add me on facebook, my name is Zeshan Habib, zeshybadboy@hotmail.com, You really need to give way more information in order for someone to be able to judge what position you should play?