I haven't gotten to spend too much time with kids of that age recently, and I don't really remember what I myself was like at that age, so I'm not completely sure whether this is true, but one of them assured me "don't worry, we are like this all the time", probably out of pity as I was running around looking foolish trying frantically to make them stay quite.
I would like to think that I made a good authority figure, with a certain amount of assertiveness, especially when I made sure that they cleaned up the classroom and put the chairs and tables back as they were supposed to. I would also like to think that they did not grumble too much about me, as I stood firmly by the door to ensure that they did not run away before they completed this task :P
All in all, I have learnt through this experience to really appreciate my teachers from now on, and perhaps also to exclude teaching as a choice for my own career in the future :P