> I get a sudden rush from doing this
> I think it could be because what I'm doing is so 'taboo' and that's why I like it

This describes me. I’ve always had a thing for forbidden romance/sex, and this is probably the most forbidden, so it’s a thrill. Strictly speaking, I’m much more attracted to sexy developed bodies than kids, but this is separate from that.

> It should also be noted that pedophile feelings commonly are discovered during puberty for the vast majority of child-attracted adults.

There are definitely exceptions, though. :)
I didn’t start fapping to kids until I was 32.
Prior to that, while I found adult-child scenarios interesting, I couldn’t actually whack off to kids’ bodies (I tried—seemed like a waste not to—but it didn’t work). It wasn’t until my 30s that some switch suddenly flipped in my head.