I feel for you. I have social anxiety and realized as an adult that I was never included because everyone thought I was stuck up, when I was really shy and afraid to talk to them first. All I wanted was to be accepted and included.
What if you find friends in situations other than work, and don’t worry about the other nurses? The suggestion of company functions could be good. But I’m thinking you get involved in a hobby or area of passion and then it will be easier to relate to and engage with others, because you have more in common.
Here are a couple helpful articles on social struggles when you’re an adult with ADHD:
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism