hi buddy, i wouldnt say im in the same position as you but it is similar. Im 20, and know how your feel about the age situation. yes your young but you feel as though you should have some sort of vocation or trade to your name. I feel the same. your mates are all off at uni or travelling, bettering themselves in some way and your not. Dont worry. the same thought would keep me awake for hours. My advice would be to think finish your a levels, if the unlikley happpens and you loose your medical, you have a good cushioning to fall back on. after that save some money in a full time job that you enjoy. one which gives you a trade and one which you can grow into. for example tree surgery. you may not find this helpful but it cant hurt.