Yes it is written correctly.
Answer: It is a fragment.
Explanation: It does not complete a thought.
The piercing sound of the alarm clock brought me back from the dead of sleep. I started to wriggle and stretch within my cosy, warm, haven that is my bed. As parts of my body were gradually turning on, I realised today was the last day of school. I leaned over at the bulky black clock. I was already ten minutes late.
As I flopped across my bed, I glanced at the mirror behind the door. What I saw shocked me beyond what I had ever felt before. As I stared at the mirror, I couldn’t believe my eyes. There was nothing on the bed! I was sitting right there, yet I couldn’t see myself in the mirror. How could this be! I thought to myself. There’s no way people can just disappear. I looked again. There was my indentation on the bed, but there was nothing above where I was supposed to be and in that moment I realized that I was invisible. Overwhelmed with fear, I sat still for minutes, unable to comprehend the situation. It was just impossible. Suddenly, my mind was flooded with thoughts and ideas. The variety of things I could do without being seen. It was a scary yet exciting feeling. My attempts to reach out to my family resulted in nothing but failure. Just as I thought being invisible was bad, the fact that I could not be heard was even worse. A wave of sadness hit like a truck. I tried everything in my power to leave my family a message. I was left with nothing but disappointment.
I was considered missing after that exact day. Eventually, days turned into weeks and weeks into months. Nothing had changed. Family and friends mourned as though I had passed away. Never seen again and I still wonder about that peculiar day.
( yeah this kinda sucks :"(( but I tried, feel free to improve it as much to your liking. I pretty much lack ideas and creativity. Ps. I'm not sure how short this was supposed to be :")) Hope this kinda helped x )
