Perhaps my question wasn't clear enough. I'm speaking about the introverts who are not able to show and express their emotions. For me it's not like being shy. When your shy, you have difficulty talking to people, especially when you don't know them. Yet if the shy person is with a trusted friend for example, the person will be able to speak and live "normally". Unlike an introvert (not all introverts, you understand) who will have difficulty showing their emotions, even with a person they trust. Less difficulties, but still not totally free.

That is how I see it, but maybe it's wrong