Hey Lama,
Female Aussie 22 year old RN here working in a metro ED. I'm guessing if you're a 'senior' you must be in the US, am I right? I really have no idea of the nursing system over there or of how long it would take you to become a nurse anaesthetist (over here I'm guessing it'd be around 4-6 years including your 3 year basic bachelor then some post-grad).
I don't know what the ratio of female to male nurses over there is, but here we have heaps (and more and more each year) and the majority that I have worked with are fantastic. The majority too (though I could care less either way) are straight, too. I'd be really suprised if people still had that perception of male nurses in this day and age.
As far as career goes, I've been qualified for 18 months now and I don't think I could do anything else. The work is incredibly challenging, is highly technical and you have a massive amount of responsibility (ie. People's lives) but it is so so rewarding and I learn something new, get to see and do the most awesome things, as well as piss myself laughing at something every single shift.
Best of luck with your studies, it's an awesome job