Answer:
The letter S is added to pluralise most words in the English language. eg. Letter to Letters Word to Words and Language to Languages. But I am a word that is pluralised with the addition of the letter C.
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
I have no wallet but I pay my way. I travel the world but in a corner I stay. What am I?
I have a little house in which I live all alone. My house has no doors or windows and if I want to go out I must break through the wall.
Lighter than feather and softer than silk, yet the strongest man in the world cannot hold me for more than a few minutes. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.