I look at him, and he looks like he's just pedaling his butt off. I try that, and I feel like I'm bouncing up and down in the saddle. I know low cadence/high gear can cause knee problems.
It takes practice to find what feels right for you... and yes, it does feel funny at first... and just not *right*.

If you keep working on high candence, you will find what feels best for you.

I know I heard 80-90 candece was *perfect*, but for me, since I have had knee issues from mashing the pedals... 90-110 cadence feels perfect for me.

Keep in mind that the candence that works for you, is not always what works for someone else. But keep at it, and you will find your *groove*. One day it will click and all come together.