Nope. "Am" is a verb and you'd miss the subject here. -> Incomplete sentence. (Used in slang, though)

Example: There's a difference -

Eat a meal.
I eat a meal.

Ahh.. thanks Shanon, really understand what you mean, but is it okay if we only write Am without put the " I " on the sentence?

You either can write:

I am

or 

I'm

I'm is a combination of I and am.  Hope this helps! :)