Lucky you!!! I started working at 14 and I'm almost 61 now. I'll probably never be able to retire (thank you Wall Street). But my brothers and 3 best friends are all retired. They definitely keep busy. One teaches gun safety and cleaning and target practice (he's an ex-cop), one makes quilts 5 days a week for Project Linus, one works part time, etc. They all sat at home for about a month to just enjoy the freedom but then got bored.
Congratulations. You're still young enough to start another career doing something you really love and no stress.