Don't know what to do, please help.?

You don't need top grades to become a performer unless you're trying to get into a professional school. Kid performers usually have on set tutors or else they sign up for online charter schools because they have to be in school until they're 16. What you need to do is participate in drama and chorus at school and bring your grades up so that you can perhaps take drama and music at college somewhere. You don't have a lot of confidence in yourself now, and you'll NEVER succeed in performing arts unless you do. Performing arts involves auditions and lots of rejections no matter how good you are, so you have to get ready for it. This isn't a career you wish for; it involves a lot of hard work as well as talent, so you need to start working on it now and stop feeling sorry for yourself.