Your professors are being very rude and closed minded. They should be sharing all of the options of nursing with you, and not putting their own prejudices on you. Most people that have those ideas about ANY profession usually have no idea what it involves.
First of all, I hate the term "losing your skills". Don't think of going into any specialty as losing your skills, but honing in on and developing a special set of skills. There are many nurses in many different specialties of nursing and we are all "skilled".
If you know that you are interested in OR nursing I suggest you see if there is a nurse you can shadow for a couple days. I was given a choice a few times in nursing school
to see different jobs and I chose OR as much as I could to make sure I knew I liked it. OR nurses can scrub and/or circulate depending on the hospital you work at. They are very different jobs so pay attention to that. I'm not going to fully explain what we do because there are lots of posts on the subject that I'll let you find
Lastly, OR nursing is not boring. I am usually extremely busy and have no time to be bored. You see some fascinating things in the OR and experience being part of a great team. I'm not saying being in a 15hr case can't get a little bring at times....but how often does that happen? I'm usually glad for the down time when I get it.
Good luck, and don't let people put down your dreams. Ever.