Depending on your age you might want to wait a bit, this is b/c of their attitude, not reality. What I mean is, they might try to make the excuse that you are going through a phase or are too young to really know, even though that isn't the case.
Since they have a lot of preconceived notions of what "gay" is then you might be the one to change some of said notions, this might take awhile as they might be shocked and disappointed at first.
And wft is with the "are you the man or the woman" in the relationship? What does that even mean? My best relationship is where we worked mostly as a partnership and as far as sex, sometimes I was the boss and sometimes he was.