Replying to Ski helmets vs. skateboard helmets...........

So today i ate shit and hit my head for the 100000th time. This time i realized it felt like my helmet did absolutly nothing for the impact. My skull just slammed against the hard styrofoam inside of the helmet with no give at all which slammed into the ground. The impact felt like it would be the same with or without a helmet. On the other hand, my skateboard helmet has one layer of soft foam then a layer of styrofoam much softer than my ski helmet. It occured to me that if i was wearing my skate helmet the impact of my skull would have been way less and way more cushioned. Does anyone know why ski helmets are different and hard? anyone know any ski helmets that have similar padding to skate helmets? are my observations wrong or something?
I would rock a skate helmet for sure if it fit my goggles and shit but it dosnt.