Kanehp
Ignore the first poster...we all do.
I would advise you to get your sight checked out fully before you do anything else...you may be chasing an impossible dream.
Assuming it is OK, the next question would be what, if any aviation experience do you have? Air Cadets, gliding etc. That's not to say these things are a prerequisite, but at some stage somebody is going to probe into your motivation, substantiation and commitment to becoming an RAF pilot...it will be handy to have the answers (hopefully truthful) ready.
I have no experience of the UAS but I know a lot of people who have. They are seem to find it immensley enjoyable and rewarding...not sure what you mean by realistic??? Flying is about as real as anything ever gets.
As far as your type of degree and sports go...yeh, all these things count for something, but the RAF selection procedure is more about discovering your aptitude for flying training and your potential for leadership. Those are the things you must focus on.