mso489,
I was brought up as a true mongrel American. There was no ethnic traditions, holidays, or even foods in my household growing up. This was due to the fact that the latest any member of my family arrived on these shores was 1847. By the 1970s, when I was growing up, all traditions, beliefs,etc. that had been brought from the homelands had been forgotten. This was one of the reasons I became interested in genealogy. I lived in Northern Kentucky for 30 years. For all those years I would see the Germans celebrating their heritage with Oktoberfest. The Greeks had Greekfest, the Irish had St. Patrick's Day and so on.
Eventually I found out where my people were from such as the British Isles, France, Germany, Italy, and so on. I never did adopt any of the celebrations or traditions from any of these places because I realized I had been wrong. My family had lots of traditions we followed and foods we ate that told who we were and where we came from, Appalachia. Both of my parents families were among the early settlers of East Tennessee. In Tennessee, people who can prove an ancestor lived here before it became a state are classified as a First Family of Tennessee. To me that is the heritage I found.
My point is that I believe that whatever DNA results say it will always prove less important than what you have come to believe about yourself. No matter what I was to find out if I did get the testing done, it wouldn't change anything. I would acknowledge it but nothing more.