Ever since my first pregnancy, I developed a super sonic sense of smell. During each pregnancy it caused me to pretty much hate the scent of everything except Ivory soap and lemons. With the delivery of my last child, the intensity of scent aversion diminished, but it's still there and it's often the cause of some heated arguments.
Your gut is telling you that your gauge is off and that your feelings about your daughter may be related to your childhood, and I agree 100 percent. The key here is that you feel hatred when you see your daughter and her boyfriend. That is a very strong emotion, and one which I encourage you to explore.
Kids now live in a world where they're given a cell phone before they hit double digits. Instead of playing with Barbie dolls, girls begin to play with straighteners and makeup -- something our generation didn't do until early high school. I can even honestly say that I've taken makeup advice from a middle-schooler. In what world is that even possible?