at least i survived and got free pizza

Today I had fifteen parent-teacher interviews. Fourteen of them were fantastic, and I heard, "You're doing a great job! We're on your side!" fourteen times. Then at the end a parent said their child said, "I asked her to explain it again and she just explained it the same way! That wasn't helpful at all!" and now I think I'm a terrible teacher and why do I have this job and I'm letting all my kids down. I'm a little bit discouraged right now.