Its mass stops you.
No it doesn't.
If it did, it would stop you pushing it in ANY direction.
After a force first puts objects up into air, their mass makes them fall
Mass does not have directionality.
And you can skip the origin BS, it doesn't work.
If a force first puts an object to the left, it doesn't magically go right.
So that clearly has nothing to do with it and is just more of the same dishonest BS from you.
When it is in the air, it needs a force to make it go down.
Its mass is not enough.
Its mass does not give in any reason to move in any direction.
No force is making them fall
If there was no force, there would be no acceleration and they would keep their velocity.
So if you took a ball and threw it up in the air, it would only be air resistance slowing it down.
A helium balloon is lighter and less dense than air
And importantly, is pushed up by the pressure gradient of the atmosphere, by a force equal to the WEIGHT of the air displaced.
As this force is greater than the downwards force acting on the balloon, it goes down.
If instead you compress that helium and put it in a steel pressure vessel, it goes down, and the weight of the vessel increases as more helium is added.
it rises without a force
No, there is a quite clear force acting there, the pressure gradient of the atmosphere.
The air is pushing on the balloon from all around, but as the pressure below the balloon is greater than the pressure above, the force from the air pushing up is greater than the force from the air pushing down, creating a net force due to this pressure gradient, with this force pushing up.
So again, there is a quite clear force pushing it up.
That’s why objects in air or water will either rise or fall in the two mediums.
So you appeal to pure magic and wilful ignorance?
Again, if you want to your magic BS, you need to explain:
why a difference in density should make it move
why it should cause it to accelerate in a certain direction;
why a particular rate;
why that rate varies with location;
why this causes a force to be read on scales;
how this creates a pressure gradient in the atmosphere and other fluids;
why this pressure gradient doesn't push everything up;
and perhaps most importantly, why when you take this force due to the pressure gradient into account, to accurately account for the behaviour of objects, your magic non force needs to work exactly the same as a downwards force proportional to the mass of the object, regardless of the density of the fluid it is in, as if that is what actually exists rather than your magic BS.
So far you have done none of that. Instead you entirely ignore it all because it shows your nonsense is wrong.