My stammer was moderate in high school and uni. But since doing a PhD, where I have encountered many situations such as giving presentations it has eased. I remember vividly being terrified of presentations and now I actually volunteer to give them. Other scary things like ordering at restaurants became more frequent as I got older. A few realisations helped me: 1) Just because people grimace or whatever at blocks, they don't mean to, and they don't care. 2) People often don't even notice. While I notice tension and think I'm stammering terribly, the listener doesn't. 3) Lots of people get stressed about speaking. 4) You can take the matter into your own hands by "coming out" before a presentation or whatever ( I have done this a few times). 5) Having someone to talk to about it (a peer is always good) is therapeutic. ​ I still have a mild stammer, no doubt. However I am not living in as much fear now.