Am I becoming "allergic" to coasters?

It tends to happen to me on GateKeeper, Mille and sometimes Dragster, as well as I305, Banshee, Leviathan and X2 among a few others at other parks, as I sit at the age of 16.

I regularly grey out on Millennium, and most of the time on Gatekeeper, however on Fury I only partially greyed out for 1 second, and not at all on Leviathan. i305 is another story, that was the worst grey out I've ever had on a coaster