Reversed stuttering?

Reversed stuttering? I'll keep it short. I am 19 years old I started stuttering in my primary school, mostly because I got teased for it and didn't have many friends. Now I only stutter in front of professors or when I have to say a specific thing in a specific moment. ~Here's the weird thing~ I am 100% fluent when I'm giving a speech, working on a presentation, in a debate, or anything that includes a bunch of people listening to me speak. ~ Stuttering and stammering has a huge influence on my grades, as I find it really really hard to recite out a whole bloody page of some history lesson to a professor. ~ Opinions? Thank you. c: