Everyone in your class is at a different point in their martial arts journey. Everyone is there to learn. I had a lot of anxiety in my class recently, primarily from comparing myself to others in my class with the same belt rank. My husband was very helpful, letting me know that the people I was comparing myself to had studied in different art forms for YEARS before coming to the form we practice together. I helped me to recalibrate my sense of expectation for myself - I don't go there to be perfect, or to be better than others. I go to learn and to improve. I will do things wrong; I will do things wrong that I think I should have mastered years ago. If I didn't make mistakes, there would be no point to me going to class - I wouldn't need to study the art if I knew how to do it all perfectly already. My instructor will correct me where he sees a need for improvement, and that is just one more step on my journey.

Go to your class. Do your best. Make your mistakes and hopefully you'll be able to learn from them. Find something you can improve on, and let improvement, not perfection, be your goal.