What a mad fool I must be

I make my own walls
Like everyone else
Not of brick, like others
Only sand and broken sea shells

It's funny actually
The big bad heartache
Barely blew
And this my defenses started to break

Now, everything inside
Flows like water
Rapidly and unstoppable
Leaving only the unsure

What else is there
When everything tangible
Has escaped
Leaving me, even more breakable