Moods come and go. If you are having a bad mood right now it will seem like it will be torturing you forever. But, it won't. Moods come and go. This one will too. If you listen to the next five minutes you will feel much better and be able to face the day today and the day tomorrow in a better mood.
You know you are excellent. When people are excellent, we tend to make other people feel jealous and uncomfortable. Sometimes, you may feel the pressure to quite being excellent so people won't treat you differently. If you are lucky, you are with lots of other students who are excellent. If you feel alone in your abilities and know you could do better but you don't want the teasing the the next short five minutes....