Dear Kara,
You are so concerned about what others think that you're not thinking enough about how you feel. It sounds to me like you need a confidence booster. Try imagining what it feels like to be proud of your work. When you use your ability and work hard at an assignment, remind yourself to tell yourself that you did a good job. From time to time, others might be critical. If their criticism is helpful, use it to learn to do something better. But, when someone teases you, try not to take those comments to heart. What really counts is how you see yourself.