They aren't even allowed to treat them like that in Basic Training for active duty. It sure isn't allowed in Jr. ROTC and if the instructor and principal allow it, you should take it higher. The student commander should be strongly reprimanded and loose his command for such an abuse.
I agree with the recommendation to look into martial arts such as taekwondo. You might even check other military programs such as Young Marines or the Civil Air Patrol.

I hope you are able to get things straightened out.