Why to use 'Change' instead of 'The change'?
Oh, it's so confusing! I cannot easily explain it. I'll write some sentences to help you. These sentences are all correct:
Change is what we can all expect.
When years go by, I fear change because it might make things worse.
(Above, change is a noun with no "the")
I got out of the house for a while, and the change of scenery made me feel better.
My company started a new department, and the change was difficult for everyone.
(Above, it is still a noun, but we use "the" because we are referring to one specific change.)
In your essay, you referred to CHANGE in general... you referred to all change, not one particular change. If you refer to one particular change, use "the."
About "life": It is just like change. You can talk about LIFE in general, or you can talk about one particular life.
Change is necessary in life.
Change is necessary in our lives.
Change is necessary in my life.
Change is necessary in your life.
Life is good.
His life is not good.
:-)