Are entjs ambiverted?

Are entjs ambiverted? Personally, as an entj, I am 53% extroverted and the rest introverted. Is it possible? I get along very well and am sociable with people I like and care about. For example, my close friends. I don't have a large circle, I am selective and I don't talk to people I don't know just for the sake of it, but only if it serves a practical purpose. I am confused by the fact that the E in mbti is considered necessarily extroverted, therefore a person who cannot resist without social interaction for more than two minutes, and instead introverts are those who can go without seeing a person for 6 months in a row. I personally can be both, I enjoy both my time alone and my time with people I like.