One of the keys, and it's so obvious it may be easy to forget, is to remember that you are talking to people. You are a person, and so many of these questions you can answer by simply asking the question to yourself. If you had your door open and someone came in, carried some small talk and left, wouldn't you like to know that person's name?
That said, I've had the same problem. With smaller groups I'm more talkative, but the bigger the groups are, the harder it is for me to find my niche. I suppose that's natural and the solution to that would be just to hang around in groups whose sizes you are comfortable with
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