I don't know what I have set, but my friends hear my Chrome all the time, so when I make a video on Youtube they will hear it. I then played around with my headset microphone settings and still you hear it, I don't know what it could be.
Maybe someone knows a lot more and can help me with my problem e.g. With microphone settings, etc.
Go to the Discord settings and select your microphone as the input device. If you did that and they can still hear your sound, your microphone may be too close to your headphones.