I had my lunch alone 。I like the food there especially potatoes and chicken。I pointed those and rice。I suddenly felt lost in my heart。I always have meals alone and sometimes feel lonely.But this time is too unexcepted.I almost did not want to eat any more。
Later in the afternoon。 I can not stop to thinking why it happened。I did not find out the answer。 But i know now i must overcome this situation 。 I must keep a happy feeling every minute。

...我给你重写吧.

I had lunch alone, like I always did. I like the courses(菜肴) in this restaurant/in the school cafeteria, especially potatoes and chicken, so I asked for what I wanted and some rice. As I sat there and ate, suddenly, loneliness overwhelmed me. It's not that I've never felt lost before, but not on so unexpected an occasion. I almost did not want to eat any more.
Throughout the entire afternoon I could not stop seeking a reason. I did not find an answer. However, I knew then I must overcome this situation. I must keep myself happy in every minute.