I do that if a person wants to have a conversation with me. But real problem comes when they don’t initiate a conversation or when more people are involved.

When more people get involved I just shutdown, I only listen and barely add anything to the conversation.

When a person I know comes around me and doesn’t initiate, I feel awkward I just don’t say anything and ignore them which I feel is giving off a very rude image to them, but I can’t help. “I’m not the extrovert between us why don’t you initiate :(” is only thing I think of there.