I'm 18 too and have about the same amount of hours but its only taken me 1 and a bit years to get them (I had saved up quite a bit before starting them).
I don't know what your circumstances are but if you're going to uni next year then what about a gap year?
I'm in a gap year right now dedicated to earning money for uni and of course for flying and I would have had to give up flying owing to poverty if I hadn't taken this gap year.
Even a really badly paid job (like mine) should get you around £10,000 in a year and that will fuel a lot of flying.
Failing that how about working in the holidays in addition to the part time/weekend job I assume you have? Thats what got me started as working one day a week doesnt bring in that much.
Whatever you do, don't get into debt because then you'll end up in a situation where you've just about scraped your PPL and then have to stop flying due to lack of funds.
Good luck