Heinz,
Sounds like they lack confidence, which comes in time. Requiring students to present work in most if not all classes is to their benefit down the line when they go on job interviews, give presentations at work, or deal with clients/patients. As an educator, it is uncomfortable at first but a necessary evil like teaching a child to ride a bike- they will fall down, but with practice they will master the skill in no time.
Wishing you continued success in the classroom.
Theresa Schmitt
