Your situation is hard right now, I have been there a lot. I've done presentations where every word has a massive block. If you can overcome that would be amazing, I always persued to overcome. However, half way through college I decided to just to do my presentations with a video voice over. It sadly never got me anywhere forcing myself to speak aloud most of the time. Those nerves really always get the best of us in that scenario. I always had such a hard time making friends if any at all in classes when I stuttered terribly publically. I would defiently stay covert. I wish I was that way