Actually anecdotally, over the course of my career, of every single male nurse I've ever worked with (probably about 2 dozen?) only one has ever been gay. I've found it much more likely to run into gay doctors or CNA's.
Be that as it may, your original post kinda sounds like "Do women find men who work in a particular profession attractive?" The "right" woman isn't going to say "eww" and recoil if you tell her you work as a nurse. Generally people are attracted to who the person is, not what they do for a living. It's up to them to make any assumptions, but the less comfortable you are the more likely you are to come across as someone who is insecure. And *that* tends to be universally unattractive.
One of the reasons I was attracted to nursing in the first place was because I was excited to break the paradigm and question stereotypes I (and others I knew) held in regards to nursing. I had a shaved head and a girlfriend when I started nursing school
and was proud to be unique among my peers.
As is the case with every profession, nurses come in all shapes, sizes, and flavors. I've worked with nurses who: rode motorcycles, were ballerinas, had side businesses at a vineyard, had side businesses as tatoo artists, traveled to all 7 continents, had never left their hometowns, had 8 kids, had no kids, survived cancer, survived 5 miscarriages, had their wives leave them, raised foster animals, were LDS, were atheist, etc. As you get further along in your education and career you too will come to realize that there is no set mold that defines a nurse. And I imagine you will consequently become more confident with yourself as well.
Best of luck.