I have seen a common "thread" here - the majority of us feel our work is not up to par - who is the par? Not to worry. I love goine to classes - there was a time when I felt "not as good" but I got over it when I discovered that most people felt the same way!
Next time you go to a class take a camera. If you begin to feel overwhelmed just go around and ask people if they would mind if you took their picture with their work. Ask the instructor when a method is being shown if you could take a picture. That way when you return home you'll will have the class in pictures, you will meet people - have them write their name on a scrap of paper before you take their picture. This helps with using different color combos etc and gets your mind off being overwhelmed beside that you will probably make someones day by admiring their work! Win Win and I think you are a winner by "pressing" on.
Have a great time at your next class.