Shuold I stick with my own kind?

After being in a relationship that I feel I am being controlled and doing all the work-- I am wondering if my problems are due to a difference in culture. My best friend tells me to "stick with my own kind." I am Russian-American and have been brought up very Russian. I have really only dated Russian and Israeli men, and these relationships broke up due to distance apart. This guy now is from Scandinavia, and I have not been around many people from that region. Thanks!