I used to stutter a lot, But a miracle happened , During my graduation I had to give a presentation but before that, I met the professor and told him that I have severe stammering, I couldn't speak among all the students. Then he permitted me to mail him a recorded video of the presentation, I recorded at home and sent him. The next day the same professor asked me to meet him in his office in the evening, He played the video that I sent him, and said " see you are speaking fluently in the video, the problem is not in you, the problem is around you. You are worrying about people around you, I have a simple trick , just practice it for a few days, you will totally get rid of this" And the trick is simple, he asked me to intentionally stammer in daily conversations. I started doing that, I did it for around 3 months, I used to call restaurants and stammer intentionally, intentionally stammered at drive thru's, After doing this for 3 months, I stopped this intentionally stammering practice. Now I am fully fluent. Guys just start doing this, it works.