Can you just not wait for 6 months. Get some studying and as much flying done as poss in the next couple of months and before you know it you will be 19. 6 months is really not that long.
And if you are applying for a seasonal position i WOULD mention your ambition to be a pilot. I have my license plus a couple of ratings and i believe thats what got me a job as Cabin Crew for 6 months. They know that you are going to use them as a reference at some point, you love flying, your enthusiastic about flying so your an ideal person.
Good Luck.