I think I realized why I didn't hear the background noise at first. I had my headphones turn down some. Your voice is coming through loud and clear, so I didn't need audio up to high.

To Test I went back and turned the audio up all the way and I can hear some background noise.

So you might try bringing the mic closer to your mouth, which will allow you to turn down the sensitivity. Which should pick up less background noise.

The background noise to me sound like a laptop fan. How far is the computer away from the microphone?