There is no single cause that will apply to everyone. You mentioned your dad but what about your mom? What does she think about it? The term AB/DL means Adult Baby/Diaper Lover. Are you having any adult baby fantasies while you're wearing your diapers? I'm a 49yo man and have had a diaper fetish ever since early childhood. I have AB fantasies sometimes but am more DL than AB. If you ever want to email me privately I'm Bob>monkeycat@centurylink.net