Ok man, if you came here looking for a reason why, you're going to be disappointed. We don't really know why. There might be different reasons for each person. I can tell you it's not likely these feelings will go away. It's part of who you are.
So anyway, there's different kinds of people here. Some are interested specifically in diapers called Diaper Lovers or DL's. Others like to regress to a more childlike and relaxing time, and we call them AB's or Adult Baby's. Some people are mix if both.
I'm on my phone so i can't get to into detail, but i hope i illuminated the basics. Also please no there is nothing wrong with you, it's just something you enjoy.