How to make calm down with many children and be a real "adult"

Sometimes adults did same things like a child.when another adult talks he/she like want to talk to and another people could listen what is the point of the conversation.This is ok if you in joke situasion but if the topic became serious and you are bussy to make you become looks like important person.You won't be get what you want, even the people will ignore you.same like if you are try to make calm the situasion that full of children and one or some children noisy or they make a trouble.Please dont yell to them or you keep talking that make them more noisy or more become trouble. You have to handle your self before handling them.if you already can hadle yourself .take the childs that noisy talk to them nicely and if another aldults already handle this, it is better for you to wacth and learn it.