discord is taking my system voice

when im talking with my friend my friend can hear my computers system voices. but not from my mic, from my pc. I dont actually know that it is possible. i just tried to find something in the settings and i could't. i also tried to delete and re-download discord. and my discord is updating itself automaticly so its not an old version. Please help me to solve this problem. system voices really messing up my fun.