Heart of Glass

I think this poem accompanied a story I wrote in high school, but I have no idea what the story was about.

A broken heart
May mend with time
But it's a little bit different
When you're looking at mine.

It's like a bull in a china shop
When you play with me.
You may not think that's true
But please don't try and see.

Please don't hurt me, I have a heart of glass.
The damage stays like a permanent stain.
Handle with care - my heart of glass.
You can fix it up, but the scars remain.

When it's re-glued together
Little pieces stay unfound
Never to return again,
Leaving me feeling down.

You can let me down easy
To avoid breaking my heart,
But no matter how easy
I always take it hard.

Try not to drop my heart of glass
Though it may not seem to matter.
You can't fix a heart of glass
If it's dropped and shattered.

If only the pain could stop.
This pain that I can't stand.
I shouldn't be so hard on myself
But that's the way I am.

I must hold onto my heart of glass,
Hold onto it so tightly
And hope that it stays together
As I picture what might be.

I mustn't break my heart of glass.
I only wish I could set it free.
If I should shatter my heart of glass
Then I lose what's left of me.