It's not really that simple. If you go through research and the experiences of people who stutter, you find that the severity of the stutter does not necessarily decide the kind of impact it has on a person's life, especially since the severity of Stuttering is variable and intermittent. For me, sometimes my stutter can be extremely mild and have a negligible impact on my life. While at other times, it can become extremely severe and start interfering with my mental health and day to day life. Your personality also plays a decisive role in how badly Stuttering impacts you emotionally.