I’m a speech therapist :). Essentially, you need to desensitize yourself to speaking with a stutter. Stuttering can be a self-defeating cycle in which the knowledge of stuttering or anticipation of stuttering increases the amount of dysfluencies due to increased tension, anxiety, etc. I’d recommend choosing a set period with your girlfriend (not too long!) and disclose to her that you will be openly stuttering and talking. Talk to her for at least as long as that period and then repeat until you can eventually speak with her freely. After that, expand your circle with 2-3 trusted people and repeat with people less and less trusted until you feel comfortable speaking freely. Another good tip is to create a short disclosure script to use when you meet new people. Part of the reason speaking to new people is so anxiety provoking for people who stutter is the facial reactions of the listener when they hear a dysfluency. Most people who aren’t assholes will not have the same reaction when they know to expect dysfluencies. These are great to use when you first meet someone. An example might be “Hi, I’m (name). Just to let you know, I have a stutter. My speech might sound different but I know what I’m saying so please wait for me to finish.” Hope this helps!