Truth or coincidence?

A few weeks ago I was asked to take two personality tests. After examining my results, I decided the tests were accurate in assessing my personality. The tests described me as blunt and a natural leader. Everyone who knows me can describe me as brutally honest. I know that when I am put in a group or around people who are doing the same task I find myself leading the group. When I do something I do it to finish it, learn something, and do it right. I want my end result to work efficiently. I organize things so that I can quickly get a "perfect" product.
Not only did the tests say I was a planner, leader, organizer, and a go-getter, it said I over analyze things. I'm a thinker, I often over think things and I notice everything. I like to ponder things before I let other people know what I have on my mind. I find myself being the first to notice things and the first to have a solution to something others do not necessarily think about. For example, even if something already works, I try to find a way to make it work better. How many other people do that?
Although the test was accurate, I looked around and saw that not everyone got the same results from each test. I also noticed that some of the results didn't describe that person at all. I am skeptical about personality tests. I feel like I could take someone else’s results and find a way to relate it to myself, I could somehow make it tie into my personality. I have such a diverse personality that almost anything sounds like me.
Personality Typing..... is there truth in it or is it simply coincidence? I'd like to hear what you think.