Scratch, your opening message gives me the impression that you think it is your choice, whether to join or not. Its not. Your only choice is to apply or not to apply.
I agree with everything that has been said about flying in the RAF, and if you are the right type of person you are most welcome to apply and I wish you well.
You will be in a very stiff competition and even if you are the best of any given selection process you might not make the grade anyway.
Finally, to be a pilot you must be an officer. I leave you to work out what that means.