Anne has it right: a PPL or even ATPL will not get you any shortcuts when it comes to flying in the RAF. Military flying is not well covered by the fATPL syllabus!
You will need to come up with a very robust answer to the obvious question of why you want to join the RAF. You have pretty much said above that you only want to join because civil aviation is not working out for you - you'll have to think of something far more convincing than that to get past the interview board.
Finally, try to get on top of your English Language. I'm not just being a pedantic old 'grammar police'
- it is one of the things you will be judged on. If your SHIFT and CAPS LOCK keys are broken then accept my apologies.