I honestly go through the same thing as you and it sucks. Just know that you’re not alone in your struggle and that it will get better eventually. Trust me on this. I’m a highschool senior and just like you, I experience stuttering and go through phases were it is pretty bad. I even had a similar instance in my class were I cussed under my breath haha. But I have used these embarrassing moments as a fuel to push myself further so that one day I can overcome it. I accepted that it won’t ever get better unless I work hard to improve it. I developed some strategies and tricks to get around my stutter blocks and they’ve worked surprisingly well. Just try to be confident in yourself and rehearse what you’re going to say many times before speaking. And speaking from personal experience, I found that saying “um” or “uh” before I feel like I’m going to stutter helps get around it.