How do I learn how to do Presentations without panicking and to also participate in discussions without being shy

imation

the key is confidence. maybe try something like.. make up a mock survey and go to a shopping centre and interview shoppers about ... well anything you want, you could even make it about public speaking! this will get you used to it, give you good social skills and an understanding on what kinds of reactions you can get and how to overcome your fear!
i hope this idea helped