I could believe it. My ancestry is almost entirely Irish, English and Scottish, with some Cherokee mixed in. I look Nordic. I have high cheekbones, very pale pinkish white skin that does not tan at all, and pale blue/grey eyes. Slightly aquiline nose, large forehead. I was born blonde...my hair is darker now, more of a light brown, but it has a translucent quality that can make it seem like it is lighter. I've also been told many times that I look just like Kirsten Dunst, who is definitely Nordic.
What's odd is that I look more Nordic than anyone else in my family, except maybe one of my cousins. My mom for instance was born blonde and has blue eyes, but she has a darker more ruddy complexion and is almost a head shorter than me. I have lots of relatives who look very Irish or Germanic, but not necessarily Nordic, with a slightly darker complexion, or more freckles or reddish hair, or brown eyes, or a broader nose, etc. I have a few relatives who look Jewish, and I suspect we do have some Jewish ancestry from way back that was covered up with some name changes. A few relatives show the Cherokee ancestry more. Some relatives just look more...I don't know what to call it, mixed I guess, or something I can't identify.
I look different somehow...I can definitely see the family resemblances and features that I share with everyone so it's not like I could wonder if I was adopted, or a changeling. But it's like all those features came together in me to represent something different.