Even though the airlines say they will hire out of High School, the majority of the carriers prefer someone who has at least two years of college under their belt. It is also a plus to speak another language. If you do not, now is the time to learn. Wait until the airlines are in the recovery stage, and then seek out the ones that will be hiring.
Interviewing: A little BS never hurts in the interview. A) The reason why I want to work for your company is because when I was a kid your airline was the first airline that my father/mother took me on and your airline frankly I have always considered the best.
B) Never say that you love to fly and you love people. Come up with something a little bit more ingenious. The reason why they do not want to hear these lines, are because eventually you will learn to hate to be on a airplane (especially if you are a commuter,) and frankly, people will occasionally get on your nerves. Does not matter what job you are in, it happens everywhere. Example; a salesperson who hears once a day...Oh I never wore these jeans, yet the jeans smell of cigarette smoke and have ketchup on the lower right pant leg. Right. On the airplane one example would be... They told me outside that you could give me an upgrade once the doors were closed, or the infamous, oh; I always bring this onboard the aircraft as hand luggage. Then there are the ones that do not know what a seatbelt sign is, and are oblivious to crew member instructions, yet they are a CEO of a company and make 8 times your salary. So what I am trying to say, is to come up with something a bit more creative, but realistic.
If it is your goal in life to serve the public, being a flight attendant is one of the best jobs that you could ever have. It pays well, and you will find that your days off are really your own. No work to take home, and nobody calling you from work on your days off.
My advice to you is to go to college, find another job in the service industry for the experience, and enjoy yourself.