WOW!!! - what you just described is a very normal feeling for a guy to have when he feels that he is no longer in control of him self or his of feelings.... most males need a sense of power with their surroundings to feel secure.
Now, what I do have to ask is have you ever been depressed before, ever had a Dx by a doctor or taken meds for it? If yes, then you are probably having an unresolved feelings/event from your past resonated with in you while you are with this girl (for whatever reason) and now your job is to locate the source so that you can start the HEALING of it.
BTW - why not just try being friends with this girl for a while and see how intimate the heart can grow from bonding out side of the bedroom.... (and) most females do not and will not judge a guy upon his performance in the bed, but they will appreciate the time and touch you are willing to give to them during this time, they feel CHERISHED that you took the time to care about their needs.
LoVe,
Rhapsody -