Completely wrong and off the topic. There is no speciality of being human. Even animals can also decide how to react. But thousands years of human evolution is the one deciding how will we react, if we see something cute, we feel happy. If we see something scary, we will be scared. Now the genetics comes, if you have good genetics, you will tolerate more which is directed to you, and result into more controlled reactions but your body will release same hormones, it is just like you are controlling them better. This is really deep topic. Stuttering is also different for everyone, many severe stutter can't even get a word out, and affecting their life massively, everyday stutter destroy self-confidence, not able to do something that has to be done, and several other things. We all are not living the same life, many are living in a very bad situation, stutter just makes it worse. Stop giving the blunt statements, you look old enough, start to think deep, start to think from others perspectives. Reading your comment feels like maturity doesn't come with age. I am not saying just accept defeat from stutter and do nothing, definitely one should find a way to make their life happy, but ignorance is not the solution.