The Princess and the Pea

I read the book "The Princess and the Pea"

One prince, one queen and one girl apper in this story.

Prince want to marry so he traveled many prace to find princess.

But he cannot find real princess.

One winter night a huge storm blew in.

One girl came the castle.

"Are you a real princess?" queen asked her and she answered "Of course I am".

Then queen tested whether she is real princess.

Queen put a green pea on the bed and put 20 mattresses and 20 fether beds on the green pea.

Of course girl was not good sleep.

Next morning she said so, queen said "Only a real princess would feel a little pea though all that fluff".

After all queen agreed she is real princess and girl and prince were married.

The pea was placed on display in the royal holl.

I can't understand this story very much.