I understand what you’re going through. I actaully experience the same thing on my English classes. Unfortunately I have no advice to you, because I feel the same about speaking in class. I’m in 9th grade and from Sweden, and I also tend to get nervous when it’s my turn to speak, which in turn leads to me stuttering even more. When I was younger I didn’t care about my stutter and I also used to read out in class, now I care more and that causes me to stutter more. Like I said, I have no advise, but I hope you come up with a solution that works for you. Good luck!