I felt worthless as a teacher. In my first semester of teaching English as a Second Language, I discovered one day that all my students had made D’s and F’s on their first lab assignment. My stomach tightened into a knot and I considered stepping down mid-semester to allow someone else to take over my class. Later that day, I discovered that I had misunderstood the grading chart and that every single one of my students had made either A’s or B’s on their lab assignment. Since most classes have a very small portion of A’s and B’s on their final grades, I felt that I had done a pretty…