When I first saw the video song Friday, I knew instantly that Rebecca Black was an experienced performer, used to performing to a live audience. No one had to tell me. You'll see why if you read her BIO. This goes a long way toward explaining her success.
If you have music, performing arts, and drama classes available at your school -- by all means take them. This will give you invaluable performance experience which will support your bid for stardom later on.