sub vs dom

I don't know what to do here... how do u tell him that as a individual who is very sexual, that i am a sub...not a dom. And that because i am a sub, that i am struggling to detach myself from my previous dom... and how do i explain to him how hard that is because what what kind of connection a sub has with her dom. How much trust and faith has to come from the sub to allow someone to have that much power of them?
And then after explaining that.. how do i make it clear that it takes a lot of time and patience to build that trust in a new person. And that the thought of showing my submissive side to someone new is terrifying. How do i explain that? Especially when people don't really grasp the whole sub /dom thing.
But think about it. Everyone falls into one category or another. You can't put two Don's together. Because then they will be to busy trying to get what they want out of the other person, instead of enjoying the sex. But they will never be statisfied because it became a power struggle.
Idk. How do i explain that?