Flyaway777..
Your never to young to begin training..
I received my Commercial license when I was 18 and it was definatly one of the best days of my life. If you think you are ready and of course if you think you are MATURE enough to do this then you shouldn't have a problem. I wanted to become an Airline Pilot from birth so the dream and the passion for flying helped me get through the tough parts of training. As you see I stressed the word Mature, it plays a big role in your future especially at the age of 17-19!
Good Luck!