I stutter and it bothers me but it’s unlike anything I’ve seen

I stutter and it bothers me but it’s unlike anything I’ve seen It happens under 2 different conditions. When I am unsure or not confident in what I am saying. I wouldn’t consider it nervousness. It is always repetitions and are usually relatively short, but it happens every sentence. When I’m meeting somebody for the first time, It’s guaranteed that every sentence I say I will do it, except for when I’m answering their question, where I’ll never stutter. It intensifies as the noise around me gets louder. This is when it is worst and the repetitions never end like genuinely I just can’t say it and blocks happen too. The blocks last close to 15 seconds. It is not horrible because I can choose to not go to places or engage in interactions in which I know I’ll stutter, because it is predictable. But I’ve just never seen or heard anybody else with it like this, but of course I could be wrong