I feel you man, stuttering tends to make one really introverted because you can never mess up speaking to yourself :) and that's fine! I took a lot of drama and public speaking classes as a kid to help me overcome stuttering, and it helped for a few years until I stopped and I sorta fell back into the old routine. All I can say is take a nice deep breath and just talk loud man fuck the haters. I still mess up all the time in public and it sucks but what can you do? stay inside? everyone has problems - ours are just a little more visible - but the people you talk to in public have way more going on in their lives than time to analyze you because you might mess up a syllable or two. They probably don't even notice and just think your throat croaked or something