To be honest, I wouldn't say you sound like you have that much of a Sissy leaning. I mean you said you wore a skirt by accident when you were younger, that doesn't really say much. Lots of boys mess about with fem clothes, and then grow out of it. As you say, we're all different, but when I was half your age I didn't wear girls clothes by accident, I wore them because I wanted to......a lot!
I wouldn't say the 'AB to Sissy curiosity shift' is a 'normal thing', I mean many AB's never try fem stuff. However, it's been my experience that most male AB's prefer to be a 'Baby Girl rather than a 'Baby Boy'.
Don't worry about it.......you'll realise what you do and don't like.
Beth