Disable (and Uninstall) MSI Afterburner., instead use the Radeon Performance (OCAT) Tools provided in the Radeon/Adrenalin Drivers.
As what it's reporting is likely not just to be inaccurate but, more so your reporting tool itself is likely to be causing performance issues.
Secondly take a look at your Power Settings (Settings > System > Power & Sleep) … for a Laptop these will typically be set to Roaming Mode; meaning it's optimised to Save Battery Power., which is fine for Desktop / Watching Movies; as you're rarely going to be pushing both CPU and GPU Components but for Gaming you realistically want it to be at the very least in "Balanced" if not "Performance" Mode., otherwise the Mobile APU will aggressively downclock.
Remember the U/GE Variants of the Ryzen APU have features (that the G Variants do not) specifically to favour Graphics / CPU dominance.
What will be happening here with GTA V is that because it tends to be a more CPU intensive game., while being fairly poorly graphically optimised; it means more often than not, the CPU will kick into it's "Boost Mode" that will scale back the GPU... when that happens because it's a game, that will take pressure off of the CPU, meaning BOTH will be massively under-utilised.
As noted above, this is in part also due to the Power Settings; thus if you FORCE it into High Performance "Battery be Damned" and let's be honest., no one actually Games on a Laptop while "Roaming"; you almost certainly have it because you're a College/Uni Student who doesn't have the room for a Desktop PC, wanted something portable, and/or just believe it's a good approach to having a PC at School... so it's almost certainly constantly plugging in while Gaming; but the typical power settings won't reflect that.
Oh and as a further note., just because you THINK the Vents are "Clear" .. trust me., they're not.
Dorms get ridiculously Dusty as any Semi-Public Area does; so you're going to want to constantly blow air threw them (of if you're feeling brave with an iFixIT toolkit., crack it open to clean up all the dust every week... and YES., EVERY WEEK! Unlike a Desktop where you can get away with only cleaning it out every 6 - 12 months)
Now personally speaking., I'd actually recommend an Apple iPad or Microsoft Surface for Lessons; and an ITX Cube System for a Desktop; as if you have AMD/Radeon Based System., today you can just STREAM from your Desktop, frankly wherever it is on Campus (or via the Internet) and be able to play your entire Gaming Library with Remotely with near zero stress on your Mobile Platform... heck you could even use your Phone or Chromebook with AMD Link.
I'm not slanting the AMD APU here., they're great for what they are... it's just for gaming, they're still not ideal.
At most I'd stick to eSports titles., like Fortnite, Overwatch, World of Warcraft, etc. anything that really could run on a potato with an LCD Screen.
The reason to get AMD APU-Based Systems., is basically to have the option of running things like Blender, Photoshop, ZBrush, etc. fairly decently... because Intel Mobile CPU with Graphics are just awful.
When it comes to more Intensive Games though., honestly I'd either get a Performance Desktop or Console (like Xbox One X) and use Game Streaming.
