Firstly, welcome to allnurses and to the world of healthcare/nursing!
Secondly, I took a while to get the courage to reply because I didn't know if I had anything to offer that hadn't been written here.
I am a CNA, have been one since 1989 and have also worked as an EMT-A, Phlebotomist, as a non-certified Medical Assistant and with lots of patients and people.
There are things that could gross you out, (as more time passes though, the less it grosses you). Possibly thinking of whatever the gross thing is at the moment at a process to take care of might help. The grossness will not stop until the wound or stool, or vomit, or blood, or whatever it is, is address, cleaned, linen changed, bandage changed, bags changed-cleaned-removed-taped down or whatever it is.
Remember to use universal precautions and remember that these are people that we are also taking care of who most likely not only dislike the grossness but feel embarrassed and guilty and responsible for it.
I have worked with a lab tech who did not like any bodily stuff. Yeah, I know? I was even her patient one day and when it came time to labelling my specimens and putting them into the transfer bags (which were safely in their formalin containters) she refused and made a face, grimaced, moaned and said something like, "un-uh!"
That did not make me feel good or cared for at all.
Hopefully you will find a way to deal with this and find your niche in the big arena of nursing!!