Hi Julia
I'm a fresh newb here too. You say you finished A levels, so I'm guessing you are British or Commonwealth? You might want to see what programs are available through the state...or possibly Peace Corps (although they typically look for a degree or some exp rather than just a warm body with good intentions).
Barring that, don't be afraid to gap year in your country (whichever that may be) as there are lots of hidden opps everywhere.
Enjoy!