An intuitive way to tell if something is a "real" force (as proposed to a pseudo- or fictitious force) - can someone subject to that force feel it, or equivalently, can an accelerometer measure the acceleration it produces?
When you accelerate or decelerate in a vehicle, you feel it. But when you jump out of a plane and accelerate towards the ground, you don't feel a force.
Noticing this fact was a big part of what led Einstein to his equivalence principle and General Relativity.
If all the particles in your body were made magnetic and you jump out of a plane on a weightless magnetic planet, how would it feel different than jumping out of a plane on Earth?
In my high school we were taught the other way - that the gravity on you in free fall is a real force and centrifugal force going round a corner is not.
Specifically the electrons in the atoms of the ground and the electrons of the atoms of yourself repel each other when they come together.
“So pushing just two atoms close to each other takes energy, as all their electrons need to go into unoccupied high-energy states. Trying to push all the table-atoms and finger-atoms together demands an awful lot of energy – more than your muscles can supply. You feel that, as resistance to your finger, which is why and how the table feels solid to your touch.“ https://theconversation.com/if-atoms-are-mostly-empty-space-...
When you accelerate or decelerate in a vehicle, you feel it. But when you jump out of a plane and accelerate towards the ground, you don't feel a force.
Noticing this fact was a big part of what led Einstein to his equivalence principle and General Relativity.