Right on! I identify as Norwegian, but in America I am supposed to adhere to some kind of special culture that all white people share. No there is no damn white culture. There is Nowegian, Finnish, Dutch, German, Italian, Indian, Chinese etc cultures.

Some of these cultures can be grouped such as Scandinavians share many culturals traits which against share many cultural traits with fellow Nordics. This can further expand to Europeans but can also be subdivided into Northern Europeans, Southern Europeans, Easter, Western etc.

However one you start talking about "white people" you have detached yourself from all meaning. You could live in Brazil, or Siberia being white. Most likely you will not have all that much in common.