Tourist I am ex-crab aircrew - and also ex-MN.
I seem to remember that the RN were the BBGB's when it came to sorting differences out in the odd pub dispute with us MN types............mind you I grant that some of the MN ABs were more like pirates in more ways than one....'nuff said on that.
The back streets of Marseille, Yokohama and Ventjspils were way too tough for RN types......
However, I would agree with Tourist - try AAC or FAA first. Although why not have a shot at Infantry or RM Commission first?
Good luck - and Merry Christmas.