"My meeting with a ghost" - opowiadanie

It was a rainy, cold September day. It was raining all the time. My friend Ania was sick, therefore she was absent from school. I promised her I would bring her my workbooks. My mom advised me to go to her the next day but I didn't listen to her.
I put on a waterproof jacket, took an umbrella and left. Going to Ania's house I noticed that the level of the river, which I had to go through was quite high. I ignored that fact and kept on going. When I finally reached my friend's house I was completely wet. Ania's mom gave me hot tea and some homemade cookies. Before I realized it, it had got dark. I said goodbye to Ania and her mom and left.
I hurried up because it was still raining and getting darker and darker. When I appeared at the river, I realized that it was almost as high as the footbridge. I got scared and did not know what to do. I probably could not think logically, when I decided to go through the footbridge. While I was going through it, I suddenly lost the balance. I thought I would fall into the river but someone grabbed my hand. The stranger helped me to get to the waterside. I wanted to thank my mysterious rescuer, so I turned around. Then I realized that... no one was there. A few minutes had passed before I pulled myself together.
It had got completely dark before I got home. My mom was really angry with me. I knew she had worried about me, therefore I did not try to excuse myself. I did not tell her what had happened. Who would believe me if I said I met a ghost?