I don't know much of anything on the subject of fetishes or sexual obsessions, nor am I or do I claim to be a psychiatrist or anything aside from a sympathetic observer. I can understand how difficult this is for you, especially when people are judgemental. Of things of a sexual nature (perfect example: homosexuality), people are often not understanding, but rude, harsh, and simply unaware of what they're saying or who it affects.
My take on the issue of DL/AB is this (take it for what it's worth, which probably isn't very much): basic psychology would suggest that you like the idea of being "babied". This doesn't mean that you are physically attracted to babies, nor does it mean you wish to be one; it simply means you may like the attention, pampering, and care that one recieves as a baby. Put in these terms, this doesn't seem all that weird. As for the diapers, (and this is assuming I'm correct, which I may not be) I think they symbolize babies to you, and may be a sort of trigger for your desire to be "babied".
I'm not sure if any of this makes sense, I just figured, "What's the harm in throwing out an idea?" Whatever the case, welcome to PC, Dave. I think you'll find that this site is quite unique, and rarely judgemental (and in those rare cases, it's not your problem; it's the other party's). Honesty such as yours is welcomed. I hope you find some of the answers you seek here.