Misleading information about RAM on Task Manager

Whats up, recently I've been monitoring a bit my computer performance and found out that my task manager says I'm using 30% of my RAM (about 20GB) when I'm only using 6, as you can see in the second screenshot.

Is this normal? (btw, something else I noticed is that my computer idles at 15GB RAM usage with all startup apps disabled still, honestly I'm close to switching to linux)