How is it possible to be too submissive

Impossible to fathom.
It sounds more like that guy wasn't all that dominant to start with? There's plenty of guys who are sadists, and somehow think they need to act like dominants because it fits the trapings. People are different and in the BDSM scene all this labeling has really gotten a bit out of control.
My advice is to go slow. I'm sure you'll notice what works and what doesn't for both of you. If you have a great need to be very submissive and your current relationship won't allow you to live out that part of you. Then is the relationship worth keeping alive? Life is short.