Most importantly, op, the others' advice such as
@Gurby and
@Qulevrius is some pretty good stuff.
If you want something bad enough, you won't let anything or anyone stand in your way, not even a bunch of anonymous online strangers.
One of the bigger detriments to this field is the disconnect between those who have been doing this job a while, and the new up and comers who treat this like the adrenaline rush they're taught in school and through PowerPoint (not completely the students fault).
Whether this field is male dominated or not, it shouldn't deter you from pursuing the profession.
@EpiEMS posted some good stats (gotta love him and his awesome statistics, seriously). He mentioned it being a mostly white male dominated field. Now, had I worried about any of this when I first began, I would have all but tucked tail and ran, but here I stay. My friends in this job---and outside of it---are as color blind as I am, because none of it (race, religion, sex, etc.) really matters at work or in the grand scheme of things.
My point of this rant is who cares what you look like, do your job, do it well, and I promise you someone will take notice for
all the right reasons, but the same holds true for the opposite end of that spectrum. Just know you may have to work a bit harder than others, which isn't necessarily a bad thing.
I applaud your focus and drive at such a young age, and wish I would have been the same at 17, so best of luck.