Regarding your first question, there was a bit of hypocrisy in me suggesting that you transform your mindset, since I myself haven’t fully accomplished that yet, only made some considerable progress. From the progress I made, I’d suggest putting yourself out there more without thinking too much of it. To do this without having negative effects on your mental health is pretty difficult and requires learning to not care what people think, which is another thing that’s easier said than done. It took me putting myself out there so much to the point where I became desensitized to the negative thoughts after to begin making progress in accomplishing this. Basically, what I’m trying to say is that it gets worse before it gets better. Also, if you have a similar type of stutter as me, when you start making progress with this your fluency should improve.