Having a good fit with the company culture and getting along well with your coworkers are very important things as you're finding out. Sometimes they're more important than the actual job. I personally would try other apprenticeships before leaving IT entirely. If it turns out that IT really isn't for you, you can go back to school to pursue mental health nursing. Lots of people keep their day jobs while pursuing what they really love during their non-work hours. Lots of people have to work while attending school and, consequently, take longer to finish their studies. Or you could work in IT for awhile and save up money for school.

Another thing to think about is to take psychological tests to see what careers really interest you. In the U.S., we have the Myers-Briggs Personality Inventory test. It can offer great insight to what you're interested in and why.