Honestly, I think femininity is the act of doing things that society considers more female than male, though there is no law book saying what males and females act like. And I think womanhood is really most an idea of a woman becoming fully mature around age 40 and subduing quite profoundly to the "wife/mother" role. Overall, like said above, there's absolutely no "typical" way a woman (especially young women) acts, and the people who actually go out and experience life and have tons of girl friends know this. The folks who think there's a strict behavior when it comes to women are folks who base women off what their mother was, or whichever girl they were most jealous of in school.
I've my entire life seen males and females as psychologically equal, but I plain think certain types of men are "sexually" attractive to my bottom-role mind (and no type of woman), so it plays a big part in why I want to be a girl. If every single man on this earth found other men to be attractive no matter what their partner looks like, I'd say I'd have much less of a face-value issue in my life. However, there are many other reasons I want to be a girl too, it's just, if I actually had a partner right now who somehow, for once in my life, was attracted to me without my transition, then this transition road would indeed be easier, I'd have a bit more confidence. Many people already have that blessing because they pass enough, or have such loose standards that they fall in love with obese asexual men who just do not provide passion for them.
I'm just so ugly/manly + high standard that it's been impossible for me to find a partner who loves me back, so actually, opposite to how psychiatrists think that you shouldn't transition because of sexuality/dating life preferences, I do think my very unique face+personality situation really plain out validates my cause. Other than that reason, I'll be honest and say my "hobbies/clothing style/personality" could work in either a man's or woman's body, as I act and dress very androgynously and don't have a HUGE problem with doing it, but I do hate my masculine body and face. Personally, I think that's sort of what femininity is, I want to look feminine all over, but I'm not interested really in being a part of strict "womanhood" - though, in my case, it may be a valid point to say I want to be a part of "girlhood".