Sniff? Okay... Interesting.
A problem like this is psychological. For future reference, in these types of situations you have to have a lot of patience. You clearly did not. You have to make her trust you to the point where she feels comfortable enough around you that she no longer feels like she is naked on a stage with 1000 people watching. You did not establish this trust. This is why you never saw results.
While it is true that some girls are less sexual than others, the way she responds to you indicates how much she likes you. Sex in this case was clearly for you because she did not like it. She didn't like you enough to be open and try new things with you. I know these things can be frustrating man. Especially when you're all ready to go and you have to convince her she is safe. I would be annoyed too.
Learn from this situation. It's not the end of the world that it is over. Most girls that I've been with haven't been like this. Then again I probably wouldn't have had the chance to be with them in the first place if they were like this. Just accept the situation and move on. At least now you have some insight from other people on how to approach situations like this in the future.
Cheers, brother
Watch me succeed and/or look like an idiot with hot girls
https://www.youtube.com/channel/UCnemaAw1mXyNtvPA6AwO7xg