This is nice and I think it really describes someone who is reserved. I am like you. I don't have any fears around talking to people, and can talk in front of groups, and participate in group activities. But I don't talk as much as other people. People have described me as "shy" but it is simply not true. I have had Native American friends and Asian friends and they don't talk as much, and are comfortable with long pauses between conversation, and I am also very comfortable with that. People can speak less and still be assertive. I might add that extroverts often get uncomfortable around someone who talks less and may actually be made to feel nervous by long pauses of silence. (It doesn't bother me when people comment that I speak less. It's their problem if they are uncomfortable, not mine.)