Sounds very familiar, I went through a similar phase. Whether you call it "feminine" or a "pushover", there is certainly the tendency to get exceedingly soft if one truly takes Buddhist practice to heart -- after all, you're supposed to eliminate ego with its defensiveness, aggression, and hard opinions. You're supposed to control your emotions, avoid harsh speech and other forms of violence, stay away from alcohol, guard your senses from violent and lustful experiences which are pretty much the cinematographical norm these days - and so on and so forth.

Leaving aside the question of masculine vs. feminine (which I think is irrelevant to this conversation), yes, I believe this phase is normal and almost inevitable. Luckily, this is not the final destination.

This phase is what my Zen Master called the "form is emptiness" phase, and what follows after can be broadly characterized as the "emptiness is form" phase.

"Form is emptiness" is when you work on destroying attachment to form. You start by giving up and destroying the crudest attachments, like coarse anger and desires. Then you destroy more subtle attachments, like e.g. the tendency to self-assert and judge others who don't follow the same path. Then you destroy even subtler attachments, like subconsciously basking in your own purity and sainthood. Then you destroy whatever remains after that. This process goes on until you pretty much lose any form; you destroy all clinging to any conceptual ground; you no longer identify with any position, especially the position of "goodness" or "purity".

This leaves you with no ground to stand on, nothing to protect you, no desires to provide a sense of direction, no values to give you purpose. This is the peak of losing form. At this point you are 100% vulnerable, way beyond losing masculinity. It's like, you are not even a person anymore. There is no personality, no individuality, nothing left - you are completely transparent with no desires, no opinions, no will of your own.

And then, once you get more or less comfortable with having no ground (you can't really get comfortable, but you can get used to it) -- you can start exploring the other side of nonduality, called "emptiness is form". This is when you realize that since nothing in life has absolute importance, you are free to declare new forms, and you have a right to assert your opinion. You can even manifest aggression when that's required by the circumstances.

So, to summarize the above: this phase is normal, keep letting go of progressively subtler attachments until you completely lose shape, and then some part of your aggressive masculinity that you're currently suppressing because of its inherent violence interfering with the Path, will be reintegrated back and you will no longer feel "feminine" or meek.