Reverse anxiety - does anybody else experience it?

Reverse anxiety - does anybody else experience it? Most of the stories I've heard about fluctuation of one persons stuttering intensity have been directy connected to anxiety,and how they usually experience higher levels of stuttering when they're 'supposed' to talk normally,and lower levels when they're around friends,family,or other party that acknowledges their speech disorder. For me - its completely opposite.When I'm supposed to talk fast,when I'm in a hurry,or talking to bunch of people who don't know that I stutter,my problem completely vanishes and my speech is almost completely fluent.That is,until I get myself into a more relaxed state of mind,when I'm supposed to not care how I come in front of people regarding my stutter (usually friends,family,my classmates,or generally people who know),thats when it hits me and sometimes I can't even get a word out.Does this happen to anybody else? TL;DR When shit hits the fan,I don't stutter at all.When I'm supposed to be relaxed and not care about my speech,my stutter intensifies.Why is that,and do some of you experience it?