Sorry to hear that happened to you.
Yes you can still be a good Christian and like diapers.
If God truly loves us all then he will love us no matter what and enjoying diapers is not a bad thing.
We all wore diapers as babies and toddlers until we were potty trained and even some older teens, kids and adults need to wear diapers.
And some of us just happen to enjoy wearing diapers and if we had to wear diapers it's a good thing that we would actually not be depressed about wearing diapers and instead enjoy it.
If your aunt truly loves you then she should also love you for who you are and that should include diapers and all.
There's worse thing that we could be into than diapers.
Some people do have a problem with people liking diapers but not everyone agrees with what others do.