Me too...and 1st tenor. I'm Scandinavian, as well (first name Kirsten, maiden name ended in son). But I would kill for broader shoulders (since I have big boobs and the shoulders might help make me look more balanced AND hold up bra straps better) and some angles to my face. I am TOO soft and have no nice defined cheekbones or chin.
We can't win.
From the way you describe your dress, the only way these people could be thinking you're a guy is if they are completely oblivious and lacking in the ability to read social cues. That says far more about them than it does about you.