who actually am I

I have been planted with no purpose.

I don't know what I'm supposed to be.

Who am I, what am I, what should I be doing?

My roots are as cold as the winter breeze.

My leaves flying over to the other trees.

My bark with no living creatures.

The other trees shading saplings.

While I'm shading my own roots.

I wish I had been planted with others.

As I grow taller and taller my life is getting shorter and shorter.

The only creature I have shaded was my leaves.

In the autumn grass with a warm and sharp breeze.

The sun and the moon were right,

I really am the one and only tree,

With no saplings, birds or creatures to protect.

And as the seasons go so does my breath.

By the time you read this, hopefully I have a bigger purpose.

I wish, I wish, I knew my purpose.

And who this tree is.

Who actually am I?