Well, I've been thinking about this a lot lately. People stutter for different reasons, depending on the symptoms, right? So, if I only stutter when I'm talking to authorities or people I'm scared of then chances are that my stutter is caused by psychological issues. If I stutter everytime even when being alone then it's cause might be more physical. For most its probably both, since both concepts are naturally correlated, unless you have an actual braindamage. My naive view on this is: Just try to figure out how things work out for you. Dont be afraid, dont let your emotions take over control of your behavior/life. Figure out your path and make it work! Good luck! :)