Please don't follow 'successful' teenagers on social media, they are very few among many others just like you. There is nothing wrong with wanting/hoping for a career in some form of the arts but sadly, once again, chances are few and far between. Look for a way of making money you will enjoy and pursue your dreams as a sideline to begin with. I think there may be agencies that take on folk for extras work but they will take a cut or charge to have you on their books. Could you afford to try a stage school? You could join an amateur dramatic society which would get you experience of all aspects of theatre work and be great fun. I belonged to one, strictly backstage, and had a wonderful time. 22 is really only the beginning of your life, particularly now when it's possible to change careers and retrain a lot later in life. I hope all goes well for you.