Or am l the only one that can not do it?

Lol, l cant do it either.

not possible. mouth and nose share same passage pipe down from ur nose / mouth - the pharynx. afterwards, bifurcates (divide) into esophagus and trachea. when u swallow, the epiglottis covers the entrance to ur trachea to make sure the food or drink goes down ur esophagus into ur stomach and not into ur lungs.

when you do, thats when you swallow down the wrong pipe

l just tried it myself and l could not do it, either! l remember learning that we were able to breathe while swallowing when we were babies, but somehow that behaviour changes when we grow older.