We often worry about things that aren't supposed to add any value lil getting scolded by manager if he sees you faffing around or you think that the homework that you did is not up to the mark etc. So the prime objective is to be a carefree person when you know who have done your job , given your 100 percent and have got nothing to worry about . Carelessness is a bad indication where you just carry out your work aimlessly. My podcast on this gives you insight of the topic , so go check it out . Do share it with your friends and family :)