Why is my PC using so much memory?

What is the make and model of your laptop? Are you on the latest BIOS update for your laptop? It might be a memory leak but you're also going to have to state which game(s) you play to experience this issue. Best way to check for your memory usage, is right after booting into GUI, check what System Resource Monitor says.
 


All games. Even if I'm not playing games my memory is very high (see second image).

My laptop is MSI 15.6" GE62VR Apache Pro-024

I've never done anything specifically with BIOS in my life so I'm not sure if I'm updated or not? Is that not an automatic thing with system updates?