No, of which I'm not. What part of BEING are you confused about? One BEING, three PERSONS. Tritheism is THREE BEINGS that make up THREE PERSONS. See the difference?
As has already been pointed out a Divine Person is not identical to a human person. There is a difference. Primarily I believe with the very fact that a human person and human being are the exact same thing. Thus when you have three human persons you also have three human beings. If this was true with Divine persons then yes you would have a point. But that isn't the case. Even though the Father is a divine being, the Son is a divine being, and the Holy Spirit is a divine being, there isn't three beings, but one Being. So when you ask the question what God is, He is One. When you ask the question who God is, there are three.
Modalism and Tritheism, are both heresies, and neither idea is reconcilable with the teachings of the councils. I get it that you have more and more educated theologians, falling away from orthodoxy. I don't doubt you on this. But it doesn't make them anywhere near correct.
If you want to believe in modalism, that is your perogative. Me? I'm sticking with orthodoxy.