Therein lies the problem. If you have something to say, then say it. Don't try to tiptoe around the conversation, especially if there are brazen extroverts in the group, because you're just going to get run over.

When you have a chance, watch how the extroverted and charismatic people handle themselves in conversation. They're not shy about talking over people if they need to. But the best conversationalists will also listen intently to everyone else in the group and address it appropriately.