Until very recently, being gay was a bar to service in HM's Armed Forces, and they remain an extremely conservative organisation, many of whose members have old fashioned, conservative values and views.
This is why the Forces are where you find dedication and loyalty to queen and country, and where you find cameraderie and esprit de corps that don't exist elsewhere.
These old fashioned, conservative values are what underpin fighting spirit and combat effectiveness, and it would be tragic if Political Correctness ran rampant in the military.
But the flipside is that you also find profoundly illiberal attitudes, including some homophobia. Many people within and without the forces (myself included) would view it as a retrograde step that homosexuality is now 'permitted' within the services. Others would find it very hard to understand your 'preferences'.
My advice would be to listen carefully to the advice you have been given.
If you really can't 'convert' to lady-lurv, then maybe you should keep shtum about your abomination!
Good luck with IOT.