Daniel Ainsleigh's reply:
When you’re 18, you may well decide that you’d like to pursue a career in acting. If so, you’d be best advised to go to one of the NCDT accredited drama schools for your training. However, these schools prefer applicants with some life experience and only accept applications from those over 18 years of age. Until then, the best thing you can be doing is to continue building up your experience. If your school has a theatre group then that would be a great place to start. Otherwise, you could look into local youth theatre groups.
Another option is to apply to join the National Youth Theatre. Entry is through audition (and can be difficult) but you’ll meet lots of people of the same age and in a similar situation to you. I think that at your stage in life you’ll find working as part of a group far more beneficial (and a lot cheaper!) than private acting lessons. Acting is a tough career and only those people who are totally dedicated to it will succeed. Working with others of the same age and building up your experience is the best way to prove to yourself that it is what you want to do. I remember how frustrating it is at your age when you just want to get started but you’ll be in a better position to audition for drama school when you leave school if you put the career out of mind for a couple of years and just enjoy acting with others.