So recently I've started playing sports (rugby) at uni. My actual skills are pretty good but one thing coaches and other players have told me is that I need to be more vocal. The problem is, I'm a pretty shy introvert and don't have the confidence to boss around players with more experience than me. It's holding my game back and I'm not sure what to do about it. It's not as easy as saying "just shout more", the trouble is I don't know what and when to shout. I tend to only speak up when I have something important to say.