Just Try!
Andy,
As others have said, just go for it. Until you try taking control of an aircraft for yourself you will never know.
If you have any concerns about your health then I would suggest that you get your medical first then you will know what is possible before you spend lots of money.
Even if you can't fly for a job you may almost certainly be able to fly for the sheer joy of flying. As an example, when I was in my teens I discovered I could not get a class 1 medical due to being short sighted, but at University I learned to fly gliders and spent many happy and inexpensive hours pottering about in a glider. Ironically, I believe that under the new EASA rules I could now get a class 1 medical but at 42 it is probably a bit too old to think of a career in aviation, but at some point, I would like to take up gliding again or possibly learn to fly either light aircraft or 3 axis microlights.
Try it whilst you are young enough, you will regret it if you don't...