What is Sad?

I believe that there are many types of sad.

So many different feelings with it.

and I have come to know many,

Just as many,

have come to know me.

I have realized that sad..

Can be people.

What is the saddest kind?

The saddest kind of sad

Is the sad that tries not to be sad.

You know,

When sad tries to bite its lip

and not cry,

and smile,

and say "No, I'm happy for you"

That's when it's 

Really sad.

Yet again,

Maybe we are all just

Sad.