I suspected you were older.That's another cause of your lack of extreme differentiation. At your age, you should be less differentiated, and more diverse in your abilities. If you were still extremely defined, there might be something wrong with you. Whenever I test someone over the age of 25, I always have them answer the test questions according to the way they were when they were young - say between the ages of 10 & 20 because by the age of 25, we begin to develop our auxiliary function, and by the age of 40 begin to develop our tertiary function. Once we develop those further, that muddies the water as far as testing goes. No one "changes" their type, they only further develop it, so ultimately, it is helpful to understand how you were as a kid.
Based on that, and on Xander's excellent insight, I would say you are an ENTJ who is doing very well at developing the auxiliary and tertiary dimensions of your type. ENTJ is "who you are" or at least who you started out to be, but now you have branched out, mellowed out, matured, and become more diverse in your skills and thinking. Consequently, you are less and less likely to find profiles that describe you now as accurately as they would have when you were younger.
Thanks for that INTJMom. I agree with you about comparing what you were like when you were younger. Only thing is when I was really young I was also very shy and therefore quieter so that can be confused with being introverted. As Psychology Today points out "Introverts have the conversational skills and self esteem necessary for interacting successfully with others but prefer to be alone. Shy people want very much to be with others but lack the social skills and self-esteem." So I would say when I was younger I seemed more INTP-like but as I have gotten older and more confident (less shy) I seem more ENTJ-like. (So actually going in the reverse direction than you had thought). I can't say I prefer being alone for the hell of it. I like being with people

On the big five link you posted I got
Extroversion (52%) results were medium which suggests you average somewhere in between being assertive and social and being withdrawn and solitary.
Orderliness (52%) results were medium which suggests you are moderately organized, structured, and self controlled while still remaining flexible, varied, and fun.
So maybe I am a mild ENTJ? Still, I find the descriptions for INTP and ENTJ fit me if I combine them. Actually the whole NT group - which means I am certain I am an NT at least!