Oh no!!!!

Yesterday, There was a class from 16:10.
I arrived at cumpus at 15:30.
I was in computer room.
I misunderstood.
I thought the class starts 17:40.
Actually, it is over at 17:40.
I noticed it at about 5:00.
Oh my god!!!!!!!!!!I am what stupid.
Mr. Lavin, I am sorry that I am late......