If you are able to speak fluently in some situations (when alone or with friends), then that is a clear indiciation that your stutter is not caused by physical brain damage. For most stutterers it is caused by their state of mind. Basically, worrying too much about your stutter and trying not to stutter causes stuttering. People speak much more fluently when they don't think about their speach and are relaxed. You worry more and more about your speach and are getting more nervous about it, that's why you might have an impression that your speach is getting worse. My advise: Relax, take it less seriously and enjoy your life how you always do