You overcome stuttering by learning to accept it. My stutter will always be there in some capacity but it occupies much less of my headspace now in my 30s than it did when I was younger. The more exposure to stuttering in front of others and the more life experience you have, the less it will end up bothering you. I was in and out of speech therapy with varying success throughout my childhood and then ended up going back while I was in med school because my stuttering became severe again due to the stress. Ironically it wasn't the speech therapy that helped me overcome it. It was realizing I didn't want to give up my natural speaking voice during speech therapy because it made me me. After that, I quit speech therapy, got busy getting on with my life, and my stutter got much better. I'm absolutely not trying to discount speech therapy, since it helps so many in our community. Just pointing out that learning to accept over time that you will have an imperfect speaking voice but that doesn't mean you are any less of a person will sometimes make the biggest difference.