please check my grammar in these sentences..

I just got started to write English MLA style...
please check my grammar in these sentences.. thanks

I was born in Seoul, South Korea in 1992. At that time, I was going to go elementary school, which means I was a small kid. When I was around 7 years old, I got a little puppy from my parents for my birthday. I was not the smartest girl, but I grew up as a warm-hearted girl because of the dog. I named the dog Coco and I grew up with her. It was my first time to have my own pet.
I still can remember the day I went to meet the dog with my mom. I was only 7 years old as I said, and I was holding my mom’s hand tightly. She was one of my mother’s friend’s dogs. It was a country house, and all the dogs were wallowing in mud. There were 5, or 6 dogs. The mother dog was licking her babies, and the dogs were whining in search of its mother. And there was my puppy who will live with me for the next 18 years. She was the only white puppy in there. I was amazed watching all the dogs, and was thinking who I should pick. But as soon as I saw the white puppy, I just decided to get the dog in spite of myself. She was not actually a white puppy. Her hair had become bright brown as she gets older. However, she was such a cheerful puppy. And I was always with her from then on.
If I was feeling sad or was crying she used to just come to me and lick on my face to wipe my eyes. I am still not sure if she knew how I was feeling, so she wanted to comfort me or not. I also went out to walk her many times. I can not even remember how many times. Since I was 7 years old, she was just part of my life and I never wondered if she would be always beside me. Whenever I looked at her face I would kiss on her head, and that was just natural. It was not a matter if it was Summer or Winter, she was always with me.
In my senior year, a lot of things happened. My boyfriend had gone into military service, and my grandma had suddenly passed away of heart attack. I was sad and depressed. I could not even eat and sleep because of stresses. I wished I could forget about all the complications of life and just go off somewhere. I needed a turning point to everything get better. I was at a transition point. That is why I finally decided to go Canada. It was a first step to the world I have never seen, and I was excited. So I just went here leaving my pretty poor old dog behind. Time flied! I used to believe that nothing would change over time, and thought everything would be like It has been, but actually everything was being changed, and my dog was also getting old. I always knew about the truth, but maybe I just tried to escape it by leaving her.
Eventually, 1 year ago, Coco died leaving me behind. It had been around 6 month since I saw him last time. I was on the phone with my parents and they told me that Coco departed in her sleep few weeks ago. They were worried for me if I get too much shocked. Indeed, I was disconsolate over the death of my dog, and teared that my childhood was finally gone with her death, and that my best friend has passed away. I could not sleep normal, and could not go school normal for few weeks. But I got better and better over time. After all her death about, I would like to quote Kowalski’s words, “it is important to know you make a difference, at least to one appreciative creature.” (126) This means, I made a difference to Coco and it meant a lot to me. There were still things after she left. Her death had made me feel a strong sense of responsibility, and I had good memories too. Now I even can smile thinking about her. Although I can not see her anymore, I still love her, and I always will. Her memories will beautifully live on. Picoult said,
“If you have a sister and she dies, do you stop saying you have one? Or are you always a sister, even when the other half of the equation is gone?”(72) I think anyone who had lost a beloved pet realizes that they aren’t with us physically. There’s no need to be so harsh. We just need to believe they are waiting for us on the other side.