Hey
I'm a girl drummer too and I can totally relate to this post!
I think there is just as much of a minority of girl drummers as there are girls who are into this genre of music full stop! I think that is maybe because of the aggressive nature of metal/playing drums, it's not something that most girls can relate too, it's not their cup of tea, they like cute shit (although thats totally the reason I love it, loud fast heavy metal, pounding the drums, smashing those symbols I can't get enough)
However I totally like to turn this into a positive. Your a rarity, You're a girl, you like bad ass music and you kick ass on the drums, be happy to be unique. Yeah you'll get some guys no doubt looking down on your drumming due to the fact that you are a female or whatever but keep a thick skin and use that as fuel to be the best you can be. I certainly do
\m/