I'm an outdoor cyclist AND an indoor cycling instructor that has been at it since 1996. In no way my enthusiasm waned from teaching indoor cycling. In fact, I was strictly a mountain biker when I started teaching and ended up converting or at least changing my primary focus to road biking after teaching the classes for awhile.
I do find that my classes attract more people that include cyclists and competetive riders as well as the more typical member looking to get fit and/or lose some fat.
I didn't come from an aerobic background and that is probably one of the reasons I never thought about making my class choreographed aerobic work. I run my own in-home personal training business and have always focused on basing my classes on training with a purpose which means the members know what the focus of each class will be and how it can benefit them.
By the way, I was (and still am in a non-class situation) an introvert, but it's something that's easily overcome when you are following a passion. I hope you seriously consider getting certified and start teaching. There are way too many classes taught by people that want to "jazz" up a cycling program by adding non-cycling contraindicated stuff.
Vertically challenged, but expanding my horizons.