I've recently earned myself a promotion (hurray!) and am now sometimes the shift leader at work, which means directing my colleagues on what to do. I work in an events and functions job - so setting up and serving at conferences, dinners, weddings etc.
My manager keeps on at me to be more assertive with the other staff, but I have no idea how to go about it. If there's a job that needs doing, I'll say "So-and-so, did you want to clean the glasses while I do the tills?" or if there are several jobs and several people, I'll list the jobs and tell them to decide between themselves who wants to do what.
I've always been very shy and very much a people-pleaser, and I feel really uncomfortable ordering people around. I'd always thought my approach to directing people was assertive whilst still being polite and friendly, but my manager seems to disagree...