Stutter in long conversation or talking with friends and family

Stutter in long conversation or talking with friends and family I only stutter when I am talking to someone close to me (after few mins) or when I am in a long conversation or when I have to talk in front of large crowd. or when I have an argument or trying to tell a story But If I talk almost normally when I talk to strangers or/and when I have only short conversations or/and when I talk in language other than mother tongue. or/and when I try to imitate . ...