Hi, I'm new here; like, literally, I JUST signed up, and to the OP, your story pretty much mirrors my own, and I've been into this even before I was even aware that there was such a thing as ABDL. I'm so happy your fiancee is cool with it; most of my family and friends (don't have an SO yet haha) take a very, shall we say, "puritanical" view on fetishes/kinky stuff or whatever, so I feel like I have to be extra cautious around how much I indulge myself.
I can't tell you how long I've wanted to get my own diapers and try it out, but finances are a major obstacle, as is the ease at which I could be found out, so I haven't got the courage to go for it yet. I'm hoping these boards will provide me with some assistance haha.