I highly doubt that you are not a great teacher. You're in recovery and certain situations can be stressful. I wouldn't give up hope just yet, you never know. Maybe you saw yourself in a bad light because sometimes we tend be so critical of our behavior. So don't wait for a rejection letter, hope for an acceptance letter! I wish you the best. I wish I had some super awesome advice, but I'll be thinking about and hope you get the job you deserve!