Friend, the same thing happens to me as it does to you. I have stuttered for as long as I can remember and the truth is that it has gotten worse over the years. Before, I could read without any problem, but since last year I can hardly even read. My family always tells me to speak slowly or to think about the words before saying them, but they don't understand that it is not that simple. Luckily throughout my life it was not a subject of ridicule, but even so I am ashamed of speaking in public, or even if a teacher sends me to look for something in another class, and above all, presentations in class are torture. I have always wanted it to go away but given what I have seen, I don't think it will happen. The advice I can give you is to speak as if you were singing and also take a good breath before speaking and exhale slowly at the same time as you speak. At first it is difficult and it sounds strange but if you get the hang of it you may get stuck less. It is also about being happy, because the more stressed you are, the more likely you are to get stuck. And lastly, when you are going to say a sentence, don't think that you are going to get stuck, because as I said before that makes it even worse.