You're welcome.
The microphone picks up sounds in the room, yes - that is, after all, what it's intended to do. You shouldn't get feedback through the mic, though, AND - there are some situations where I've had awful feedback, hearing myself a few seconds after I've said something.
That's typically (in my opinion, anyway) a problem with the platform, not the microphone. It never happens on Zoom or Skype, for instance, but it seems more related to certain proprietary sites - I was doing an interview for a medical study a few weeks ago, and they were using a special site that I'd never seen before, and we had to do the audio over phone because the feedback on my end was impossible to deal with. I've had the same thing happen when facilitating a virtual workshop on another less-well-known platform.
I assume you know you can turn down the gain on the back of the Yeti, right?