The first day back at work never doesn't feel weird. Negatives! Teaching, or specifically, speaking in front of 30+ people after spending most of the previous weeks alone or with a few people at most, just feels weird.
I am a bit of a different person when I teach, and I do wish I could channel that energy into other things. I don't exactly know why it's easy to be energetic, educational and entertaining when I teach but when I stream or make a video or try to write about stuff I'm just boring.