I echo what has been said, it's always important to have a lot to say in an interview, and if you can back up questions like 'what have you done to further your career aim to be a pilot" with EVIDENCE, you've got as much chance as the next guy :-)
I'm currently being sponsored by easyJet, so have had the experience of interviews and selection processes. I would suggest going to Uni, flying with a UAS, maybe doing some time towards a PPL if you can afford it (but caution max number of hours permitted for some schemes!) Get work experience with an airline in your part time or within aviation generally, read around the area, and just make sure you can overload an interviewer with evidence to PROVE your enthusiasm! (a lot of people go to interview and say 'I want to be a pilot'. Great. So do the other 1000 people who've applied) It's all about coming across as genuine, enthusiastic and motivated, and ensure you look far more attractive to the company than the next guy.
All the best, the end result is more than worthwhile!
