mic picks up desktop audio

Hello, I just got this new headset that comes with a mic for my laptop and I've looked up a ton of tutorials and none of them seem to help me fix my microphone and audio issues. Every time I try to record a game to see if my mic worked it either comes out muffled or it plays a loud noise and it...

I will keep this short. I have been running into the problem where sometimes my audio will sound muddy and echos. I decided to record my desktop (set to my headset under audio settings on OBS) and mic/aux (set to my headset's microphone under audio settings on OBS) audio on separate audio tracks...