A little progress... I tested out the splitter im using with another headphone and mic combo and i still got the mic through headset... So its either the splitter itself, random settings or Windows 10....
I hear myself speaking from headset microfone...
My friends also hear sounds like music and game sounds when we are in skype.
Playback is off.
Im using Windows 10.
Headset im using is Razer Blackshark 2.0