Im a girl but i wanna be in infantry for the marines?

Okay i know every guy thinks girls arent tough enough to carry a dead body of 200-220 lbs and run thats bull crap okay alot of girls can do that i can carry 160 on my back and im 13 dont you think i can make it go into more weight in the next 5 years yes i think so..i think they should make it harder on girls that wanna join infantry and just give them a chance and if they qualify then thts it! I can run 3 mi. In 18:35 sec which is over the qualification...i eat healthy also and take care of my body since ive always wanted o work infantry cause i dont wanna fly no plane they say alot of women would die in infantry they die in planes to from cannons or grenade launchers or just regular rocket launchers so please tell me why its soooo bad for irls just to try?