Cloudy, I think your post is very interesting. I've been tossing around similar thoughts lately, because I too have always just been more interested in females on a social level. Your mentioning that the desire (if that's the right word?) curbs when you have access to a female resonates in particular, as I'm a 23-y/o virgin and the thoughts often come back to "well, maybe I just want to be with a girl rather than actually being a girl". I've experimented with CD a couple of times, and the curiosity has gone in and out and I never felt like it was "me". The conclusion I've come to is that it's the feminine presence that I'm craving.
Honestly I think that some guys are just wired to feel most comfortable around women or in a domestic/family setting. I think it has to do with favoring stability over risk. Its been hard for me to come to terms with; even the CDs and GLBT crowds at least have a group they can relate to and identify with (not belittling their struggles by any means though). Guys like I describe (myself included) are usually just seen as "unmanly" or "weird" by other males and prone to isolation when they're not in a relationship, which seems to be the norm in modern times as relationships change and the focus shifts more and more towards the individual. Learning as much as I can from other cultures has helped a lot; in Asian cultures especially this kind of temperament in males seems to be more generally accepted and even encouraged as part of the Yin/Yang balance. Most every tribal culture has some kind of social role for what are essentially "men who stay with the women", which isn't always associated with CDing.
Tromps, I hope this helps you too, somehow; the important thing to realize is that you should just do what you want to do until you don't want to do it anymore.