Answer:
I begin your sentences. What am I?
In all the world none can compare I am a tiny weaver my deadly cloth so silky and fair.
I will go within you and destroy you. Only because you wanted me too
Some try to hide, some try to cheat, but time will show we always will meet.
I am found in the sea and on land but I do not walk or swim. I travel by foot but I am toeless. No matter where I go, I am never far from home. What am I?
No matter how little or how much you use me, you change me every month.