Yeah, I have a tendency to do that. If you read up on the Meyer Briggs personality types, it helps. It may not be 100% reliable, but at least it gets you thinking about how other people view the world.
We did the test during my college course: turned out that myself and my 3 closest friends all had the same personality type (a mix of INTP/INTJ). I suppose it could be argued that we get along better with eachother because we have the same way of thinking.