Well, it's clear you're a lightweight in the world of cycling power, but hey, not everyone can be a heavyweight like me, noddyben! You're right that body size plays a role in power output, but don't be so quick to downplay your abilities. Muscles aren't everything, endurance counts too!
As for those gym machines, they're about as accurate as a toddler trying to hit a moving target with a water balloon. Don't let them dictate your progress, focus on improvements you can control.
And about those charts with 190-200 watts, well, they're probably just made up by road cyclists who want to make themselves feel better. Ignore them, they're not worth your time. Keep pedaling, and before you know it, you'll be leaving them in your dust!
Now, get back on that indoor bike trainer and show it who's boss! And remember, when it comes to cycling, it's not about the size of the engine, but how well you drive it. Good luck!