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If you're in high school or college, there's no better time to start your acting career than now. Get involved with school theatre as soon as possible. Sign up for theatre classes in your school if you can. Audition for school plays. High school drama programs are a great way for you to get a feel for what the acting world is like and start building your experience and skill as an actor. If you're in college, you can likely find a student-run theatre program that has open auditions. Take advantage of any opportunities to act you can find at your school. Search your schools list of clubs and organizations. Contact the ones that put on plays and ask them how to get involved. Although there are plenty of movie stars who didn't go to college, or did go to college but not for theatre, it certainly can't hurt. Especially if you're coming out of high school with no theatre experience, getting acting skills and experience in college is a worthwhile step. Research colleges and their drama programs. Things to consider when choosing a school include: How well rated is their drama program? What kind of classes do they offer? How many of their alumni are professional actors? Do they have an agent showcase? How well does the schools and it's drama program fit with my goals as an actor? If you're not in high school or college, you should still be getting acting training. Most movie stars have spent many years honing their acting chops. Any opportunity to do so will improve your chances. Search online for acting classes and workshops near you. Whether you're in high school, college, or neither, you can get acting experience in your current town by volunteering for local theater productions. Audition for upcoming productions. Contact local theatre companies and ask what kind of volunteer work they have available. Even if it's not acting work, working at a theatre company will give you an "in" for when they start casting for later productions. Alternatively, look for community television stations near you. Contact them and ask about volunteering opportunities. Once you start volunteering, learn as much as you can. Observe how things work in the company. Ask questions. Get to know the people involved. This is the time to start build a relationship with the industry and those inside it. You don't have to be in a movie or play to work on your acting skills. There are ways to improve your acting on your own as well. Make short films with your friends. If you have friends who are also interested in some aspect of acting or movie making, this is an option for building experience that requires no prerequisite or luck. Even if you're alone in your pursuit of acting skill, there are ways to practice on your own. Practice monologues in front of a camera. Practice playing different types of characters and personalities. Review the recordings you made and look for areas of improvement.
Take advantage of school theatre. Get a theatrical degree. Take acting classes and workshops. Volunteer for local theatre. Get all the acting practice you can.