Practicing alone- Imagine you are the president, think of anything and start speaking. Understand what words/sounds give u pain and try to make a workaround or simply try just to get that thing out. I don't know how but you have to develop trust in yourself that no matter what happens, you will do fine. Also, find someone (your mother is the best person if u can get her help) who can support u mentally while you embark on the journey of transformation. I myself stuttered in school and couldn't say my name during a quiz. For years, I have practiced alone and my speech has improved a lot. You just have to derive that inner strength from somewhere. All the best!