I've thought that exact same thing about not being able to express myself the way I want to. I also have a small lisp so I've always lacked confidence in my voice in general, which is pretty sad. It got way better once I left high school, though. The anonymity of college and the real world makes me feel like whatever I do, no one will notice anyway, which helps me not care as much about my speech issues and has settled down my anxiety issues in general too. (Looking back, I realize now that no one cared what anyone else did in high school, too; I only felt that way because of the environment.) It lets me focus more on myself and what I say rather than how it sounds when I say it. I gave a short 2-minute speech without a single stutter a few months ago and although I was noticeably physically shaking afterwards, it was my first time speaking well in front of people and that was special. Granted, I highly doubt I will ever be "cured" or even ever truly be okay with my voice, but I'm aiming for tolerance and I think that's enough.