Hi there.
The first page of this thread contains all the important links. You can get plenty free or very cheap flying given your age. Air League, later on UAS etc.
If you're not one of the (nothing but jet won't do and piston is necessary evil to get there) wannabes, sure, this may not be that great.
Gliding clubs offer very cheap, even cheaper flying for teenagers. Some do 'dirty work' help hours against launches or flight time (if that's not free already for so young). Ideally, for initial training, winch launches are cheaper, practicing circuits.
UK cons - if you fly a lot, you can't solo before your 16th birthday on glider.
Did I mention, after suitable training, you can help out driving golf cart or some old car helping to retrieve gliders to the launch point :-D Even before having DL.
Not exactly racing, though.
Gliding will teach you to appreciate many things about flying you may take for granted with the spinning thing in front of you. Also, these scholarships available for teenagers, are for motorgliders as well. Well known Grob Tutor G109, Falke, T61 etc. You can get free hours, while learning the stuff, having engine experience etc.
While there are not as many 'exemptions' for full JAA PPL for gliding and motorgliders, going the NPPL route, you can find yourself with day only VFR simple single/motorglider/microlight licence that lets you enjoy flying.
As mentioned, GAPAN offers full PPL scholarships as well, although you're too young for it now. If you have some air experience, you'd show commitment and serious interest for the application, not just a passing interest.
Gliding and motorgliders will definitely help you with many aspects of flying power later on (or, SEP as some prefer). Had I been your age in the UK now or earlier, I'd make the most of it. DO NOT think that you're not likely to succeed in the more lucrative scholarship applications. Too many think the same. You can't win if you don't join.
AFAIK, you can't log SEP time towards PPL right now, due to your age. Gliding is fine, although the solo age restriction. Many youngsters solo on their 16th birthday, weather permitting. Nice Bday to remember.
If you don't hurry, but stick to your plans/dreams, it's easily achievable, it just takes time. Something people your age aren't best at. Waiting.
Had I known how much fun and more 'flexible' regular gliding is, and getting a misconception shattered years ago, I wouldn't have bothered saving money as teenager for paragliding kit. It just wasn't used enough without me having car/transport. I thought gliding is more expensive, more elitist, one has to own glider etc. How wrong.
Have fun. Amazon is good for cheap second hand books, as you're likely to know.