Also block stuttering here I don't know if thats an option for you, but I used to sing along with music on my ears (at home in privacy of course, don't want to sing "my heart will go on" while shopping lol) It was easier with a guitar though, because I didn't focus that much on the speaking part that way. I also noticed after a while I had to sing with my mouth wide open to "remember" my body to use my mouth and my lungs properly while singing and later, also speaking