Don’t despair! Many programs really focus more on the artistic capabilities of their applicants and much is determined by the audition process. You might want to focus on more conservatory style options and review information in some of the older threads here regarding schools that are less academically stringent. Here are a couple of recent examples:
http://talk.collegeconfidential.com/musical-theater-major/1854405-academically-less-selective.html
http://talk.collegeconfidential.com/musical-theater-major/101257-academic-importance.html