It really shouldn't matter if a nurse is straight, gay, bisexual, asexual, transsexual, transgender, questioning, curious, or just not interested. Unfortunately, there is still plenty of discrimination against people who are, let's just say, not heterosexual. Discrimination is wrong and it hurts all of us. I've seen good nurses---good people---become the targets of discrimination because of whom they love.
If I'm your colleague, your instructor, your classmate, or your patient, I care much less about your sexuality than I do about your ability to do your work. However, as the OP is all too well aware, some people are homophobic. Sometimes co-workers are homophobic. Sometimes patients are homophobic. I wish I knew how to get around that. I don't know what it's like to be gay but I do know what it's like to have a patient decide he/she doesn't like me because I'm too this or too that. It's difficult.
I have to say that when I've been a patient, the sexuality of my nurse or other caregivers has been the least of my concerns. But I realize that for some people it does make a difference if the nurse is straight or gay, married or single, whatever. Maybe people are looking for a little commonality---I don't know. When I've needed care, I was hurting too much to inquire much about my nurse's personal life.
OP, I hope this helps you sort out your issues. Please feel free to check out our many forums---there have been a number of threads for LGBT nurses and students and perhaps you will find some kindred spirits. Please take care!