WHAT THE FUCK IS INERTIA I CANT COMPREHEND IT

Au contraire! Without that picture I'd never have figured out his question.

muh higgs field

I don't see the Higgs field as an explanation. If you actually checked the math, you'd see that you can recover a linear space from the properties of the HIggs field, whereby inertia.
Likewise with Mach's Principle, which is simply a confused way to define an affine space (which is a metric away from being a vector space).

Why does math exist?

Youre asking the wrong question. What makes an object move?

So what? I don't see the point

Explanation:
(great channel btw)

youtube.com/watch?v=gSKzgpt4HBU

When a force acts upon an object, it causes acceleration dependent on the object's mass.
The bigger the mass number, the lower the acceleration for the same applied force.
This is inertia. It's not that the object is being held in place by something, it's that an applied force is less effective the larger the object is. It takes more force to accelerate and decelerate the object, so it will """prefer""" to maintain it's current velocity.

There are physical particles blocking them. Also there is a vacuum pulling the particles into their respective places.

I made a thread about describing these concepts:

>>Only your power of will