Windows 10: I cant use my headset mic

I have an all in one pc and for the past year I have been using this pc without realizing that every time I use my mic, the computer uses the built-in one and not my headset mic. I tried to go into settings and there is no option for a headset mic. The headset I am using is has a 3.5 mm jackthe ones that plug into a controller. My pc also has only one place to insert the jack and not a separate mic and volume jack. I tried every possible thing I could find on the internet and still cant fix it. I can still hear everything in my headset but just cant use its mic. I have tried to do it with se

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Headset mic

PC Specs will help us help you.

What is the brand/model of the headset mic combo?

What front panel audio jack(s) do you have? Some are only mic or only headset, some can be either mic or headset whichever is plugged in and some are combination headset/mic.

 

Headset mic

Depends on the specs of your hardware, you have not given enough detail.

PCs are normally separate Headphone and Mic sockets.
Laptops a Combo socket (TRRS).

Headsets usually come with adapters to cater for both scenarios.

My headset has a Combo plug (TRRS), and an adapter for separate Headphones and Mic sockets.

You can plug the Headset Combo plug in to a Headphone only socket, but the Mic won't work. there is no second R contact.

 

Mic picking up audio output from headset.

Either they are playing around with you or you have a chat running, with the MIC allowing everything, no matter what. Suggest unhooking your headset when not using.