Definitely gender therapy you need.
Your story is actually similar to most all the MtF's here; we try and try and try to be "manly" (and some of us succeeded) but eventually our real Self comes out, demands to come out, and like you said, it comes down (in many cases) to a simple choice:
Transition, or self destruct.
There are many ways to defend the country, even if combat arms isn't going to be an option. There's 10-100 non-combat troops for every one front line soldier/sailor/airman/marine. All of those other roles are just as honorable as the combat arms people.
As a temporary "holding" action, may I suggest you indulge your girlie self while in private (such as your apartment or room) and/or wear something discreet while in public (such as lady's underwear)...and no, you would not be a freak if you did that. You're allowing a major part of your life to LIVE.
Hope this helps.