Thinking more about this I have a better idea for you....why not spend a bit of money and sit the GAPAN tests. Also go to WH Smith and get an interview book. I am guessing here that you will probably struggle to come across with the sort of maturity that an airline will be looking for. That isn't me being critical of you it is just symptomatic of someone who has left school and not pursued a career before embarking on an airline career. When you get asked questions like give an example of conflict, how have you managed people and how you would deal with a captain that breaches SOP's it will be hard to come across with a half decent sounding reply without a bit of the rich tapestry of life. Also most of your contemporaries go on to University and it could be seen as a negative that you haven't. Your CV could be binned without you ever knowing just because 10 other guys/gals went to University and applied themselves and proved to the recruiters that they can stick to a course of study.
Very few airlines take on people who are so young with no formal education. Those that still do put them through intensive psychometric and verbal reasoning testing plus a whole battery of other things to determine that the candidate has the right attributes for the airline concerned.
Better still if you hit a downturn and get knocked out of your job then you will have more to your CV than just being a pilot.
Finally, few people I have come across ever research the job hunting aspect of flying which to me was always my number 1 priority. I didn't get into flying training to be some know it all swot that was intimately involved with every aircraft type I flew. In fact near the end of my training I actually found some of it quite boring and irrelevant as it seemed so far removed from what commercial airline flying involved which I knew a fair amount about from friends that were pilots. I wanted a job that gave me a return on my investment.