You won't be doing massive research as a Navy doctor. You will be a Doctor, who if lucky, will get to spend a tour doing research, if selected maybe once in their career. The Navy needs doctors fixing and keeping their Sailors and Marines healthy (and their families). If you really want to do research, then being a civilian doctor is going to be much more flexible to what you want to pursue.Many insights are provided that lead me to believe both are NOT impossible, but likely NOT probable. Also that USNA or any academy may not be the best choice. Many postings in here about the medical option and how long it takes to get through it after your 9 yr academy + service commitment. Then you could start med school, at approximately age 27 at the earliest. Stuff like that. Make sure you research it.
Seems like you have great ambition and goals. Whatever you decide to do I wish you all the best.