I'm right-handed, but I write with the pen resting on my ring finger also. I've heard that it may create more writing fatigue and I definitely experienced some of that in high school, but I don't really write as much now. Everything is typed now and it isn't a problem anymore.
It didn't bother me at all until the workload really picked up. I was in IB (17 years ago!), so the workload was higher than most high schools.
If it helps, I also have very nice handwriting with precise and well-defined lettering.
