we feel the atmospheric pressure in all directions and the net resultant force will be zero
EXAMPLE :if we are in the normal position we feel the pressure in all directions and the net is zero
if we are infront of the moving train outer atmospheric pressure is more than the pressure between train and us
These are not quite right. There are two reasons/cases: first, your chest doesn't collapse because it is filled with atmospheric pressure air. Other parts don't collapse because water is largely incompressible.