I'll admit I'm atypical here -- yes, I managed to hide it from my father and step-mother for the first two years, but at some point in my early twenties, I just learned to deal. For me, "dealing with it" entailed masturbation for the cramps (serious, an orgasm helps) and I used Instead (a disposable menstrual cup, fashioned sort of like a diaphragm) so I saved the fluid in a jar and painted erections and portraits of men with it.
Hey, you asked, this is how I dealt with it.