Hey mate. Absolutely been there before. Can assure you time will help and with that, people will grow up as well. I do really really recommend you speak to your teachers in private and inform them on it... It really helped me a tonne, and 99% of the time, the teachers were more than happy to accommodate. You can request to do speeches in private, as well as not being put on the spot. Definitely don't let this define you. All will be good mate.