Any coach will tell you that if you want to get good at anything, you need to practice. I'm not here to blow smoke up anyone's arse. However, when I put in the hard work and practiced every day for years.......I improved. The world is a crappy place, and people are going to judge you, mock you, and even discriminate because of your stutter. Do the work, seek out treatment, seek out support groups and keep moving forward.