Let me tell you how to stop stammering in this post. Firstly, you could go and visit a speech pathologist. They will try to get to the point of why you are stuttering, and can help to correct this using some exercises and speaking techniques. This, however, will cost you a lot of money, and you can find similar methods to what they tell you on the internet also.
Stuttering is made worse by stress, so find a way to control it in stressful situations, and relieve it when you have spare time. I took up yoga to help relieve my stress, and it worked brilliantly.