We know that, every object which has mass attracts every other object which has mass too. Now, why don't two objects certainly fall into each other? For instance any two stars or even any two objects which are not of that cosmic scale.like two chairs of different masses etc. I'm very confused!!

Dear student,

Force of gravitation depends on the masses of the objects and the distance between them.
For instance, the masses of stars are huge but the distance between them is too large, that force becomes so small and not eough to move them.
Now.two chairs very less distance apart, have very low masses that force of gravitation is negligible.

Thanks.