Are you at Uni? If so, why are you not on your UAS?
If you're not yet old enough for Uni, go! I knew a chap who was classed PMU (perm. Medically Unfit) for aircrew at 16 (Tests in Advance) for childhood hayfever, joined his UAS, was 'kept an eye on' for two years, and has now just left the RAF after 16 years service, flying a single-seat FJ.
Chequesix is a blasé old fart whose 3,000 FJ FH have turned him cynical. Sure, join and you'll have to put up with a lot of 5hit and being dumped upon, but it's a great and rewarding job for a young bloke, 12 years is nothing, and even this forum might just give you the impression that you'll be surrounded by a great bunch of people, and that the cameraderie is second to none. (So I'm told). Flying airliners is for (and makes you) middle aged - and the money's no better than reasonable. Do it when your age qualifies you!