Am i to young to be planing my life as a nurse in the navey?

Im 14 and life is planed all the way up to 25 I want to be a nurse and join the navy Im kind of a girly girl But i yoused to be a tom boy I m not in perfict shape ether im not fat but in not toned of fit Should i start to rethink my plans Ps imin realy addensed classes and should be in colege when im 16-17