After spending a lot of years in the ATC, completing a FS and joining the UAS, by the end of Uni I found I was deemed to be medically unfit for military flying. I have since spent twenty years flying airliners and practicing various forms of hooliganism in small aircraft on my days off.
While I'm pleased with the direction my life has gone, part of me regrets not having the opportunity to be able to fly a grey pointy reheated thing, even though statistically I'd probably have been streamed elsewhere anyway.
In short, if you believe you will look back and regret not having tried, get on and do it, given the opportunity is there for you. If you don't, there'll be someone out there who will who won't thank you for wasting their slot.