I find sometimes you've just gotta push through it, I truly know it's hard and extremely embarrassing but the more you hide yourself away and don't speak to people the worse your stutter will become. That's how it works for me anyway. At the end of the day if you're an adult it's highly unlikely any other adult is going to make fun of you or judge you for your stutter. I haven't encountered someone like that since highschool and I'm 27 now. It's all in our heads. Just keep trying to push through, You've got it :)