The good news is that you are taking steps in college to train to become both an officer and to have a career in aviation. Your certs and training and flight hours will get you there. However, your role as an officer may not be as an aviator, despite your aviation training/ certs/ hours from college.
Professional Flight is a Tier II major in the Navy, which carries more weight than tier 3 majors, and less weight than Tier 1 majors (ex. Mechanical engineering) in the closely guarded Colonel's secret recipe for who is given a role in Naval Aviation among those who put this on their preference sheet. There are always success stories - I know of two Tier IIs from this year who are a commercial and private pilots who are heading to Pensacola eventually as SNA, but I also know of 1 private pilot/ 1 professional flight degree pilot from last year who went SWO / SNFO path respectively.
Grades, evaluations/ recommendations, ASTB scores, fitness scores are components you can certainly influence and if you put forth a solid package in all these areas, then you increase your chances. You can prepare for the ASTB including stick/rudder skill, but I wouldn't worry about that, yet.
The Marines have guaranteed aviation contracts *any guarantee is contingent - meaning as long as you have no disqualifying condition, and the Air Force puts a higher value in their scoring on prior flight experience than the Navy. You can confirm too if the Army currently has guaranteed aviation contract option. You should learn about the mission and airframes of each and consider applying there too.
I recommend you get a Class I flight physical by a physician who normally performs these for the military before you go the professional flight path and pursue a flight career with the military - it will cost you, but a good investment to confirm if you have any disqualifying conditions - imo better to know this up front.
Honestly your best focus in year 1 in ROTC as a flight student is to learn like a sponge in NROTC/ be present with a good attitude, excel in grades, be active in your unit, excel in the basics of flight in your degree program. the flight blocks and NROTC time along with studying require great time management, but you can do it.
Good luck.