At university I studied Commerce/Accounting - I didn't participate all that much in class, but really tried when there were participation marks at stake. These would be a source of stress, but it got better as I went and I made sure to prepare well in advance for any presentations (I still stuttered nonetheless) After university, I worked in public accounting to become a CPA and now work in Tax for a large Tech company. I block more than anything else, but it's not too bad and doesn't get in the way (it has seemed to get a lot better as I age)