Don't leave school, because if you don't make it as an actress, then you'll need something to fall back on. Take acting classes, and dancing and singing classes too, if nothing else, they'll help with your posture and vocals for your acting, plus if you're trying to get a part, people are more interested in the auditions who have had some lessons than some random schmuck who doesn't know what he/she is doing. Get involved in the theater when you're in High School, that'll help too. Also keep an eye on the classifieds section of the news paper, sometimes movie companies will advertise in the classifieds, and sometimes they need like a 14 year old girl for example.
