Well I know you dont want me to talk to you about going into college but airlines/forces educational requirements normally ask for 2 A-Levels.
Anyway, try to seek sponsorship, or, if you're fortunate enough to have enough dosh for a ppl then find your nearest flying club and crack on with learning to fly. A ppl in Britain will probably set you back around £4000 (I think!!!)
If anyone disagrees then just say so as I'm quite junior myself within the aviation world.