Never forget that you can always write about your past.  Just ask yourself some questions.  Try these:

If you live in America, are you or your parents or grandparents from a different country? Which country or countries are your ancestors from? When did you or your parents/grandparents come to America, and why? What was the assimilation experience like? What was hardest for you or your forebears to adjust to? What aspects of your native culture did you or they retain, and which changed? Did you or they experience prejudice or suspicion? What beliefs did Americans hold about your culture, and were those beliefs right or wrong? How do you think your native culture benefits America? Do you think your relationship to another country gives you a different viewpoint from other Americans?