My pc

So this is a build i completed four days ago. I'm quite frankly stumped to why i'm getting

-Low Gpu Usage in near all gpu intensive games

-High cpu usage even on idle (60-80)

-Fps drops as bad as dropping from 180 fps to 9

-This build can literally only play fortnite at 100 fps.

Specs: Ryzen 3 2200g @3.7ghz

Gtx 1060 6gb

Evga 500w bronze certified

asus rog b450-f gaming

2x8gb corsair vengeance ram