Tear drops are falling

I am sad and for that
I write

I am sad about
things that cannot be undone

I am sad because of
I things of my past

I am sad because of
disappointments people have caused
 upon me

I am sad because
I had expectations that
weren't met

I am sad because
I wasn't stronger
at that time

I am sad because
only now I've understood

I am sad because
through pain I've learned

I am sad because
I am human

Don't we all have our ups and downs?
How about you now?