It is outside of my personal experience so I might be way off track but what you wrote strikes a chord somewhere. I think that you may be turning from a boy into a man or, perhaps, you are already a man but feel that girls expect you to behave like a teenage boy or immature man.
My own experience of teenage boys is that with some exceptions, they tend to be more self-absorbed and unsympathetic than girls of the same age. Real men, though, are concerned with the happiness and pleasure of their partners. They tend to become more nurturing and suitable for parenthood. In a way, it is as though to transform from a boy into a man, a male must become more female. Certainly, a man is less of a slave to his hormones. People use the expression "embracing one's feminine side" although I think that it makes males more truly manly.
Perhaps you miss relating to girls in an empathetic way, and think back to how you felt when girl partners regarded you as a girl. However, if you can love a girl the way a girl can, I think that you could both be better for it, even though you and she both know that you are definitely a man.
Just a thought.
