No it's not weird that diapers turn you on.
I'm a diaper lover myself and diapers turn me on as well especially wet diapers and the wetter the diapers are the better.
I get plenty of pleasure out of wearing diapers and they're also very convenient since you can pee in them or even poop in them without having to run the to the toilet.
There are many of us that like to wear diapers and diapers are a turn on for many of us.