Blood hell mate don't blow all you inheritence on this quite yet... you are so young just have a bit of patience and take you time there is no rush.
If I were you I would do your A-levels and work at a local airfield in the holidays to get a better flavour for it all. An additional 2-3 years in school would benefit not hurt!
Patience is a virtue and whilst all teenagers probably lack it to a degree if you really want it your time will come and you don't want to blow a whole load of cash and end up with nothing to show for it.... the flight training industry is full of people who will take your money and promise you the earth in exchange.... be really really careful