I met a ghost in the library with my friend

We found a ghost in the library of the school, it was a primary school.
That day, my classmate and I were using the library for class since our classroom was used for the standard six examination.
When I went to school and walked up the stairs to the library, I heard my friend Catherine screamed :'Ghost! There's a ghost in this library!! ' She almost cried out , she's the only one who can see a ghost.Everyone was afraid of that 'ghost' except me as I had just arrived at the library.
I'm not sure if it's real or not, I didn't believe what they said about the ghost from the start. But, the person that I could believe was Catherine 'cause she really saw that ghost, it was a female ghost with long hair. I completely believed what she said because I vaguely saw a dark shadow behind the last row of bookshelves in the library. I whispered to myself ' It's a dream! It's a dream!' but it isn't a dream! Hopefully the ghost didn't do anything to us.

I thought for a while: 'It was a bright sunny day, ghosts are supposed to appear in the dark or at night,how did she get here suddenly?'

So, this was my first horror experience with friends , it was an unforgettable experience