To join the RAF as an officer you must be able to demonstrate competence in written English, amongst many other things. You are sadly lacking in this area. You will also have to be physically fit and have an opinion on world affairs, politics especially those that involve the armed forces. So start working on these now.
Being in the ATC you should have, via your CO, a direct link to the RAF's recruiters and if that fails, try the link below.
https://www.raf.mod.uk/recruitment/r...aircrew/pilot/
As for cheap flying, there is no such thing. Flying is expensive. So you pay in cash or activity (or a bit of both). The activity is working at flying clubs or effort in finding grants, scholarships and bursaries.
But the most important thing for you for you to do now is improve your English. Without that, not much of your dream will be realisable.
PM