I remember being a member of the ATC at 14 years old and being in the same predicament. I was told at 17 I'd be to tall to be a fighter pilot and that ended that dream.
After studying A level Maths, Physics and IT I then decided commercial was my only way of getting a job above the clouds and went to Uni in order to get a decent job to put myself through training.
I regret my move and wish I had joined the RAF as a pilot but on something I'd fit in. the Queen could have paid for my training and no doubt I'd still be loving my job, instead I have an office job and have to foot the full flight training myself at 27. If the forces appeal to you then go for it, I wish you all the best and grab as much flying as you can in the ATC