One odd day

It's my strength that you know of
It's my toughness that you can see
It's my calm that you know
You can have my shoulder to rest and cry
You can see me smile when you feel down
You can hear me soft when you want to rest
But there is that one odd day
When I can break, when I am lost
On that very odd day
I want you to read my mind
I want your shoulder to cry on
I want you to be just by me.