Hey, it's part of nursing! Luckily, I don't have a hard time with poop or pee, I've cleaned up after too many pets. Vomit is another story, however, though the closest I've come to losing my lunch has been with really grossly infected wounds.
A story from my student days...One afternoon, I heard my preceptor called for help over on the other side of the ward. I ran over, to find everyone staring at this patient who was crawling down the hall on hands and knees. He had a bad intestinal bug, and had been in isolation, in restraints (posey). Somehow, he had wiggled out of the restraints AND his gown, torn out his I.V., and crawled out into the hallway. Not only was he stark naked, he was completely COVERED in excrement! My preceptor yelled for me to grab a gown. I did so, and tossed it over the patient, who immediately ripped it off, and continued on down the hall.
My preceptor hollered again at me, "No, not the patient, silly, get ME a gown, to cover my uniform, and get one for yourself!!
We both covered our uniforms, and we tried to get the patient back into the room. He did not want to go, and kept breaking away from us. Worst of all, we got the giggles, and couldn't stop laughing!! If this had happened on the night shift it would have been okay, but it was daytime, and there were visitors watching, one of whom reported us for being insensitive. Heck, the patient didn't mind! He was so confused, he hadn't a clue what was going on. As a matter of fact, I remember him grinning as he was crawling down the hall. It was only when we tried to spoil his escape that he got annoyed with us.
Eventually, with four nurses helping, we got him back into the room and shoved him into the shower. I got the job of showering him, and again, he was not co-operative, and kept trying to leave the shower before the job was done. By the time he was cleaned up and back in bed, my uniform was a write-off. I had to go to Emerge and borrow a scrub dress to wear for the rest of my shift.
I had one student in my clinical in first year who began to gag the first time we had to change and adult diaper with a code brown in it. She got used to it eventually, and did really well in the course. So, don't despair, it's something we all have to deal with!
Best of luck to you!