I hope you were able to pursue nursing, afterall. Being an introvert is not going to affect you moving forward; it is actually a good thing because as an introvert you tend to listen to people. I am an introvert myself and I have been a nurse for 14 years. I cannot imagine doing anything else. I loved talking to my patients, but I found it hard to connect with other coworkers talking about themselves. I loved talking about a new research study and school (not small talks), but only few people can relate with me as well. You will be ok; go for it!