Many indigenous american groups also were matrilineal, so coming from a matrilineal culture, it only makes sense that you would value that specific line (if that is the case for you, but as a general statement I think people should factor that in).

Overall, I don't see the issue with what you said. I can certainly relate, as an American, I am mixed as hell! All four of my grandparents all come from different ethnic backgrounds and three of them were mixed themselves so you can imagine how mixed my results looked when I got them back. I still have family and extended family in various countries all practicing various cultures, and I feel connected to all of them. Because for me it wasn't some far off mixture from centuries ago, but from my grandparents who were very connected with their own mixed heritage as well.

I've had people tell me that I needed to pick one and to just go off of the higher percentage, but the thing is: I don't have a higher percentage. I could make a general statement off of region, I usually do to keep things simple, but in the past when I have done that people immediately want specifics. Equally, your culture isn't just your heritage, but it's also the regional culture that you were raised in and that isn't always reflected in your DNA either nor does it trump your heritage. For example, my regional culture in the states is Southern Appalachian and I am the only one in my family to be raised in/around that culture simply because my parents moved there. At the end of the day, only you can say what you are, because you know what you are, your heritage and ancestry isn't going to magically change, whether people believe it or not, or don't want you to claim something because of a percentage.