"It was only then that I realised they had mistaken me for someone else"

It was Monday, I got up little late than the normal time I always get up. First class was at the gym class. Once I got the school I hurried to the gym class. I saw that my classmates were running and met the teacher. He told me to change my close quickly. I went to changing room and changed my clothes very fast. Then I ran as my classmates. But I wasn't the last one person who late. There was girl who also hurried to the class and went to changing room. I was the only person who saw her was late. Finally, the gym class finished and we went to our next class. It was biology class. We started to do science projects. Emergently, my stomache hurt and I needed to go bathroom. When I got back to the class, all my classmates started to stare at me with meaningful eyes. It made me uncomfortable but I didn't know what to do. Actually, in that time I really wanted to go home. Their cold glaze and murmuring talk was horrible to me stand with them. But no one wanted to tell me what was really going on there. After all this, school's last lesson bell rang I got up qickly and left the school. Next day, I didn't to go to school because of my classmates impolite attitude. But I thought, If I don't go to school I would be get in awkward situation. So, I decided to go. Once I got to school, my classmates started to apologize to me. It felt really weird to me and I asked them what happened. Julie's mobile phone was missing yesterday and they thought it was me who stolen that phone. But they found the real stealer after I left the school. It was only then that I realised they had mistaken me for someone else