True multiple personalities is exceedingly rare.
Most often, what is being experienced, is allowing ourselves to express and feel the feminine traits which we don't allow ourselves to feel, because we don't think it's acceptable. After all, most males grow up being told that behaving or feeling things that we think are restricted to what girls do, is absolutely prohibited, and it's the worst shameful thing, for a boy / man to feel or think in any way that a girl/woman might. To this day, both mothers and fathers, exert the belief that boys must NEVER behave like girls in any way, that it's the absolutely the worst, most shameful thing a boy could ever do.
And so we repress it, as deep into our subconscious that we can. And when the feelings emerge, we distance ourselves from them by trying to attribute it to some 'female side' personality, hoping to pretend that it isn't what we really are. We assign those feminine feelings to 'our female side', insisting that 'it's not really who I am', it's just 'a side of me, but not the REAL ME', because we can't accept that we have all those feminine feelings.
Reading back through so many forum posts, there are an astronomical number of comments about 'it's just a side, it's not the REAL ME', in desperate attempts to deny what people are feeling, all because our society simply cannot accept males having what are perceived to be stereotypical feminine feelings.
I'm now 67; and had thought that social acceptance would have changed over the past 50 years. But, it turns out it has not.
I'm here now for 15 years; and still, the most common posts are of men desperately hoping to express that the stereotypical feelings that they experience, are just 'a side' of their personality, absolutely incapable of accepting that it's a true part of who they are.
I'm not chastising anyone. This isn't their fault. We all grew up with this, and believe me, I understand why you can't accept what you are. I went through it myself, and it took years to accept.
But accept it, we must, because until we do, we will continue to deal with all the internal conflicts that come with it.
Be who you are. You don't have to do it publicly. But try to accept it, even if you feel you have to hide it from the world, because you don't want to deal with all the problems of being OUT will cause.