Dropping out of university for fear of oral presentations seems a bit extreme to me. Taking some time to get perspective might be good. Perhaps you should email the professor to find out the requirements regarding oral presentations. Once you have a better understanding of what the requirements are you will be in a better place to evaluate your situation. Maybe do some best case / worst case scenario thinking with a friend. What is the worst that is likely to happen if you must give oral presentations? Is that really worth trading a degree? No one can answer that question but you. But I do encourage you to do this thought experiment with a friend who gives honest advice.