Visit the RAF Careers Information Office and get lots of booklets. Keep your fingers crossed that the world of politics will change before you are 18, and work bloody hard at school. The aiircraft you seek will only come after many hurdles have been crossed, and your education is the first big one.
Join the ATC, get a Glider Pilots course and a Flying Scholarship. Live life to the full and dance outside your comfort zone on occasions.
Finally do not allow anyone to tell you that aircraft will be unmanned robots when you come of age ot that you are too young to chase your dream. You have set your sights, now go and get your dream.
Downside: OASC are pretty good at what they do, and the bottom line is that you have either got it or you havn't, but hard work will play dividends in any walk of life.
Good Luck