Can anyone help me remember a book, where author was female & she cured her stuttering by changing the mindset in her late 20s? More in post.

Can anyone help me remember a book, where author was female & she cured her stuttering by changing the mindset in her late 20s? More in post. Hey guys, So, this book was posted here this sub couple years back, and I read only the first 5-6 pages, then got busy in something, so I didn't get to finish it. The author started the book with this paragraph, I paraphrase: >An old man was sitting on a bench, I asked him, "how would you feel, if you had to think hard about every word you have to speak out of your mouth?". The old man replied, "That'd be like living in hell / I'd rather die." Thank you. Edit: Got it! Thanks u/dhavalr786