Where do you begin when you want to be an actor?

Most actors are “average Joes”.  The key to their successes is desire (which I sense you have), a strong drive to succeed,  and learning the craft.  (You also need to learn the business as well).   There is plenty of work for extra’s and up-and-coming actors.  However, you need to start somewhere.
So you must get out there!
Take acting lessons (at school or informal)
Read all you can, Audition whenever you can, and talk to other people who want to be actors.
Develop that drive and believe in yourself.  YOU HAVE TO MAKE IT HAPPEN.
I hope that you act on your dream to become a performer, and one day you will not be anonymous- but a serious and hardworking actor!
Consider sharing, liking, and upvoting!