A few points to think about:
Molecules
of air (in a gaseous form) are widely separated.
The forces on them are not constant but
only occur for very short time during collisions between each other or the walls of the
container.
Liquids are virtually incompressible and you can't solidify a liquid by pressure
alone. The kinetic energy of the molecules will "keep them apart".
Try and find out about
the Pauli exclusion principle – there are only certain allowed energy levels within an atom or
molecule.
What is a molecule of air – there is actually no such thing. Air is a mixture
of gases, oxygen (diatomic), nitrogen (diatomic) and a pretty small proportional of other
gases mostly monatomic. The diatomic molecule will not bend to take up a smaller volume
although the vibrations may reduce at high pressure.
Now for some
explanation.
A gas withstands the pressure exerted on it because the molecules of the
gas collide with the walls of the container. Nothing happens to the size, shape and speed of
molecules as the pressure is increased. If the pressure is doubled the volume of the gas is
halved and obviously as a result of this the molecules hit the walls of the container more
often.
Because the speed of the molecules stays the same the force ON each
molecule at a collision does not change no matter what the pressure is. It only changes if the
temperature of the gas changes.
The size and shape of the molecule is kept the
same by the electromagnetic forces within the molecule. In the same way that a bed spring
returns to its original size and shape when someone gets off a bed so the molecule returns to
its natural size and shape after a collision.
Eventually under high pressure the air will
turn into a liquid (if the temperature is low enough). As I have said, liquids are virtually
incompressible. The electrostatic force between the electron clouds of the atoms resists
them being forced together. The size of this force increases as the distance between the
atoms gets less.