If a big chunk of ram isn't available this is usually because your system is using at as video memory, typically in the absence of a full GPU card. If you don't do a ton of gaming or video editing you can probably go into the BIOS and reduce your video memory to 1-2GB, or if you have a separate GPU then set it to as low as possible.
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Where would that be in bios? I've got an asus but unsure currently what specs
Mine is under the advanced tab and video memory. Of course my computer is 10 years old though so it has an actual BIOS, newer computers have a similar UEFI menu.
What other hardware do you have installed in your system?
Can you take a screenshot of the Memory tab of Resource Manager?
It looks like the BIOS is reserving the memory for something. Reserving memory is pretty normal, but 8 GB isn't. Have you tried resetting your bios to default settings.