OMG, I actually thought that I was the only one who's doing this! I've done that a couple of times, when I was doing a presentation in class, when I was introducing myself. I blast on some hype music during this time and it kind of make my nervousness go away. I think this really helped because we aren't able to hear our voices as we speak. You know, those times when we stutter and we hear it, we would stutter more (if that made sense). I guess this thing of blasting music really helped, xD.