I'm currently in an animation course which also let us experience illustration which is what I looked forward to. However now adays whatever I have to do for school, I'd get paralyzed over how it won't be good enough. How I'm lagging behind other people who a lot of times have more experience than I do. It's affecting my classes as I can't absorb information until the class is over but I do review the material itself and do whatever is necessary after class. But for the most part there's a good chunk of 10-20%, worst case scenario 85% of the class I won't be able to even move my digital stylus. 

How does one get over it? 
How does one even get better?