Fear & Anxiety: Can I really do this?

I have been having bad dreams. Not nightmares, per se, but just unpleasant dreams. The dreams have been about beginning my position as a full-time English teacher next fall. I do not know why I have so much anxiety about starting this position. I feel that although I have much room to grow in my journey towards excellent teaching, I have done a good job this year in my student teaching. I guess deep down, I fear that I will be inadequate. Teaching is such a huge responsibility. Am I up to the task? The people who hired me believe that this is so, but deep down I have serious reservations. How do I teach literature when I often struggle to make meaning out of the texts myself? How do I teach writing without expecting students to write in my own voice? How do I prepare over a hundred students to become productive members of society? I do not want to fail my students because in failing them, I fail myself.