Is it..
the mind
Disaster strengthens me
When something disastrous is going on, your mind becomes more active to survive.
I bend what you see
It's the mind that gives you the perception of your world. It can change the way you see things in life, both physical as psychological.
Individually I can show you the way
You think with your mind and you are the only one who can access it, it's your mind that can show you the way. When you have to solve a question or you need to find a solution for something, you'll use your mind for it.
I am alive night and day
Your mind is always alive, even when you sleep or dream.