Please check my sentences gramatically (12.9 - 2)

I will not go back home early today because I have work to finish. I have a duty to finish it by myself. I can't guarantee the exact time when I will finish work. Some people listen to their boss if the boss don't finish work, they can't go home. Some Koreans dream to go go other countries like Europe or the US. Most of them can't make their dream come true because they lack a bit in the English language. Even they have to give up their possessions such as their house, friends, family and so on. They would leave Korea without their family, friends etc. I heard that Canada is not competitive compared to Korea. I hope to live more freely in Korea. I think if I'm not that good in my current job, even if I change my position like going to other countries, unfortunately the result wouldn't be different. That's why I have to do my best in my current position so, I could run away from my routine life one day. The most important thing in my mind that I'm thinking about is my current position.