I know how you feel, mine shut off at 75 too but according to NCSBN, " the number of items answered is not an indication of a specific pass or fail result. It does indicate how close your ability was to the passing standard, but it could have been either above or below it. A candidate with a short examination may pass or fail just as a candidate with a long examination may pass or fail".
Majority of people here did seem to pass at 75, so let's be positive about it.
Have a look at some threads here .... they do inspire and make you feel a lot better.
Good luck to you!