LOST

The first day of class at university, I didn't find my classroom en got in in the wrong classroom.

I had arrived very early and I didn't remember it, so I thought in these moment I had to go to the classroom. I looked for mine and I found it. I didn't know anyone but I entered.
The teacher said to me: "why so late?", but I said nathing and I sat down.
I heard the class and understood that I was in the wrong place.I worried about it and I wanted to go out running!.
But I first wanted to be sure, so I went to the bathroom and walked around another classrooms and I saw my classmates.So came back, I sat down, I waited,I took my things and I went with the teacher and I told her: "teacher, I feel so bad, I am sick.I gotta go".She answered me: "ok, see you tomorrow".And I told her: "sure,bye".
So I went out, I sat down in the corridor and I waited the time to entered to class.