College is full of student groups, find one you like for its own merits and as a side project strive for a role that includes a little bit of audience addressing. I took on a secretary role in my fraternity that involved frequently addressing the whole chapter, and joined the 4-H alumni that volunteered as leaders for 4-H youth events. Unfortunately it is a skill that benefits less from dedicated practice and more from repetition and familiarity.

College is a great opportunity to develop these skills, but it does seem that the low-hanging fruit has been picked over (tour guides, student council, excreta).

I'm from Canada, I hate to reinforce the polite/sorry meme. but ya.