Imafuji-sensei has a point for the most part. The other fun parts are the ji-geiko (sparring match) with many friends, either local or foreigners, and the meetings with many friends from all over the world.
At first, you might be scared of it, but in time you'll get used to it and get addicted to it. It's like you fight for the matter of life or death. That's the fun part.
Who knows, you might be a very good kendoka (that's how we call these athletes, who practice kendo) with a special attribute. Just give it a try. If you like the first lesson, you'll most likely to like the rest of the lessons and the usual training.
I'm a 2nd Dan (Ni Dan) kendoka, and nitoka. I practice kendo for 5 years, but I'm not that good in shiai, however, I try my best to be a very good kendoka.
Don't hesitate to tell your parents about Kendo. I didn't hesitate to tell my parents about it, and they welcomed my option to practice kendo gladly, since they know I'm an athletic type. :)