I would agree with previous posters who say go and have a flying lesson, be it in a glider, microlight, helicopter or fixed wing. This way you can find out if you have an aptitude for flying before you start looking at careers. You never know, you could have a fear of heights or motion sickness etc...!
There are thousands of different careers available in aviation. I work at an airport in the South and I get to work around aircraft all day every day. I look after a number of different areas associated with airport and aircraft operations and I love the airport environment - it's unique. I've organised Spitfire displays, General Aviation fly in days, hosted the BBMF and Catalina etc yet I always saw myself in the left hand seat of an airliner. Life doesn't always work out the way you planned but there is more than one way to skin a cat....
I still apply for cadet schemes as and when they come up just to see what happens. If all else fails, i'm in an industry I love and as a PPL holder, I get to fly at the weekends - best of both worlds as far as I'm concerned.