I checked with myself, and you are at home and we calmly talk, without guessing, on whose side of the problem. But the webcam is not limited to Skype for a long time, even there was a voice search where a microphone is needed. There are video chats, etc.
These services will allow us to identify the problem or make sure it is not there.
One of the few websites that allow you to test your headphones, earphones and more. I have tested my earphones with this site and the results were great. But don’t forget to turn your volume at a low level.