I gave my first public talk at age 17. The society provided just a one-page outline of suggested material and a few Scriptures. So to fill an hour a person had to do a lot of research of one's own. I discovered that I was a fairly natural speaker and, TBH, really got off on the sense of power that comes from holding an audience. I would even use stories from Bonanza to illustrate principles of right and wrong.
In later years I used what I had learned about public speaking to lecture at sales conferences. Last year I was best man at my brother's marriage and managed to have the entire reception rolling in the aisles. "It is indeed a great privilege to finally be asked to be best man at one of Trevor's weddings..."