Third World Culture Kid

All my life I have moved around. For as long as I can remember, I knew that nowhere was permanent for me. Both of my parents get bored easily and my dad's job requires us to move around the world every three to four years. It's the perfect combination for them. As I've grown up I've come to realize how wonderful this opportunity was for me. However, it has had some weird effects on the way I view myself.
The majority of people are obsessed with the idea of where you are from and 'what you are'. By this they mean what culture do you identify most with. Typically when answering this questions outside of the United States, I refer to myself as being American. However, I've noticed that after moving back to the states after almost eight years of living abroad I don't exactly relate to being American. The longer I lived outside of the country, the more I began to grow away from the lifestyle and culture of it. I now view myself as a mixture of all the different cultures from the countries I've lived in. This makes answering the question of "where are you from?" very difficult to answer because I don't typically reflect the stereotype of a typical American girl. But why is there so much importance in being from one place? I know of many others that also feel as if they are an outsider because they don't reflect the exact representation of the culture that they're from. I believe that it's better to pick up things from other cultures. We live in a society with so much access to other ways of life that it almost seems ridiculous to not explore other lifestyles and add aspects to your own lifestyle.