영어 문법과 표현을 자연스럽게 고쳐주세요

영어로 쓴 독후감인데 문법이나 표현이 어색한 부분을 봐주실 수 있을까요?
강아지의 가족과 인간 세상으로 떠나는 이야기인데, 책을 읽고 나니 기대했던 내용과 조금 달라서 아쉬웠어요.
아래 영어 문장을 자연스럽게 고치고 싶습니다.

I’m a dog. The heroine is a dog who lives with her family in a culvert. She has an older brother, a younger brother, and a sister. Her younger brother is going through a rebellious phase, and his teeth break and disappear. Her dying grandfather says he went to the counter. I become curious about the counter. When I ask my father about it, he scolds me. After my younger brother disappears, I accidentally meet an earthworm and learn about the human world and the counter. Eventually, I decide to leave my family and go to the human world. When I wake up, I have become a boy. At a barbecue restaurant, I eat rice the way a dog does and end up at a police station. I meet friends and struggle to adapt to the human world. I go to school and meet the earthworm and my gym teacher. I also meet my younger brother and sister. My sister cannot adjust to the human world and becomes mute. My younger brother is ill and dying, and I see my father’s leather being sold. I realize that my life as a dog is ending quickly. I give the earthworm the rest of my life and leave. It is a story about a dog who loves the human world and leaves to find the earthworm. Reading this book, I was shocked by how people behaved. The boy had hoped the human world would be wonderful, but it did not seem to meet his expectations. The ending was terrible, and seeing the cruelty of humans toward the family made me feel sad.