I can't quite answer your question but I would like to point your attention to something. You likely want to change your stutter because you don't feel comfortable or even in the wrong for stuttering. This is not the case. You are beautiful, just the way you are. And I know how easy this is said but hear me out: It's true. It really is. Let me tell you something: Others are idiots for laughing at you or even making you feel pressured. It's solely their fault and not yours. You stutter, yes, but there's nothing wrong or bad about it. It's a different way of living or speaking but it's not bad. And you have the right to ask for the same respect that non-stutterers give/recieve. If you get stuck in a block and your eyes start hurting because you can't roll them back further, take a break. If you feel like you might pass out because you've been holding your breath the entire time (I'm speaking from experience), take a breath and slow down. It's not your responsibility to make others comfortable, it's actually the other way around – at least it should be. Take care <3