DS in AFROTC had an option, but to get that option you had to MAX out. He maxed, and next semester(spring freshmen) his AFROTC job was PT FCC instructor.
I am only saying this so posters and lurkers do not assume AFROTC cadets at every det can have an option. At his school, it was basically a 1X good deal.
He commissioned last week, and 7 of his 8 semesters he was there no later than 5:30 a.m.
Something to take into consideration which I am sure -Bull- will agree with me is that as you progress in ROTC, so will your duties, and you will need to carve out time for it. DS as a POC (jr) had to attend meetings, those meetings occurred before PT. He had to write and submit evaluations for cadets in his flight. He was also assigned cadets as a POC to mentor, on top of submitting his paperwork for his career field. In the end ROTC was 20+ hrs a week on a good week.
This is why I said +1 to kinnem, time management, is going to be the key.
Physically you can get your body to meet the max, but mentally and emotionally is a different realm. You will get it very quickly if you want to be in the military, if you don't get it, there is nothing wrong with that because it was not your path. You are 17, maybe 18, don't stress out on this.
Do your best, give 100%, whatever way it falls, it falls; at least if you give it your all, you will never ask what if?
That's what we all want for you. No what ifs.