Hi! Big choice. Travelling is great and once you start flying, although you may have staff discounts you may not get hols at the right time to go with your buddies. There is nothing like regret...
If you do chose to go travelling don't just not turn up for the interview - that will look bad (maybe they won't remember you when you reapply but who knows - it common courtesy anyway) mayb you could make up a good reason why you are not attending the interview and let them know.
Or you couild just go through the process and go to the interviews- sometimes airlines have a number of interviews and sometimes even quite a lot of time between 1st and 2nd interview and then some keep you on a wait list for a while b4 starting you in a training school. Suss out the interview process and dates.... Big choice but if your really unsure you could go to the interviews and still not take a job offer if you had a good excuse. Anyway you're only young, airlines love people with life experience and travelling is great experience. If you dont want to miss out go travelling and apply next time!! Best of Luck!