What branch of the military is right for me?

i am 13 i am 100% sure i will join the military i am stuck between wanting to be air force para rescue or combat control / navy corpsman or mp /and army combat medic or ranger or green beret/and i also really really want to join the French foreign legion and i know i will but i do not know if i want to join one of Americas military branches first im nice i care about people i want to help people im looking for adventure i love to travel and i want to help the world and serve the world as a solider not just america