Emilie, this is a very common issue for younger instructors. It is good to remind them you are not teaching them to be adults you are providing them with information you know and they need. You are a subject matter expert which is regardless of age. When I first started out as an instructor I was teaching computer networking to senior staff that were 20 years my senior in age but used systems that were no longer being supported. My focus as their instructor was to be a subject matter expert and knowledge transfer agent. I tried to get away from the term professor, teacher or instructor but always called myself a knowledge transfer agent. Hard to say if this will be of any value to you but it did work in my case. James Jackson