You can use meds to help, and another user recommended cold showers and nofap which have also helped my confidence. You're basically where I was around 4 years ago. You're 23 \- that's basically the start of adulthood and where the career grind begins. Personally, I joined the Air Force (with a significant stutter, mind you) and it's worked out surprisingly well. Regardless, I'd certainly be looking for other jobs and speech therapy. This world is not a nice place for a man who stutters, nor is it a nice place for a man working a dead end job. Luckily, you can do something about both.