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gaming headset mics are usually positioned right by your mouth so they pick up everything - keyboard clicks, fans, even breathing if you're close enough. first thing to check is whether theres a noise gate or noise cancellation toggle in your headset's software, most decent ones have it buried in settings. if that's not helping, try moving the mic a bit further from your face or angle it slightly away from your keyboard and pc fans. cheap headsets just have bad mics though, so if its a budget model you might be stuck unless you shell out for something with better filtering
Most headset mics are just too sensitive by default - they're designed to catch your voice clearly, which means they're also catching your keyboard clacking, chair squeaking, whatever's happening around you. I had this problem where my mic was picking up every keystroke and my PC fan like it was sitting right next to the intake, and the solution was dialing down the mic gain in Windows (or whatever OS you're on) through the sound settings, then testing different positions - even moving the boom arm a few millimeters away from your mouth or adjusting the angle can make a huge difference. If your headset has software, check if there's a noise gate or noise suppression toggle that's disabled. Sometimes it's just not turned on out of the box.
The mic gain setting in your headset software or Windows audio settings is probably cranked too high - before you start moving things around, dial that back first since it's the quickest fix. One thing people skip: check if your mic has a physical mute button or noise-gate switch on the cable itself, because some headsets ship with those features disabled or set wrong from the factory.
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