My pc is performing slower than it should

Hey guys,I had recently built a pc which I thought was capable of running most games I had even checked benchmarks with the same specs and my pc just ran horrible compared to them.I tried to play fortnite and my fps is all over the place and shoots from like 150 down to 10 all the time even in buildings

My pc specs are: Gtx 1060 6gb 16gb ram Ryzen 3 1200 B350m gaming pro motherboard Vs550 power supply

\https://www.userbenchmark.com/UserRun/29013530