Need Advice

I'm in my senior year of nursing and every year in clinicals my instructors tell me how quiet I am. I know I'm quiet, but I feel like I can do a good job. Even though I don't talk constantly when I'm in my patient's room doesn't mean I'll make a terrible nurse, does it? Sometimes it feels like that and I don't want to continue nursing school. However, I really do want to be a nurse someday! My problem is getting really nervous whenever my instructor is watching me. Also, this past week I had a patient who was quiet too, so it made it even harder when I tried to start a conversation. I've really been working on confidence ever since I started the nursing program and I am getting better. I just needed to vent for a little bit. My instructors make me question my abilities because I'm not a loud and outgoing person. I know I am able to communicate when I need to and be confident, but how do I show this to my instructors? Is it impossible to be a nurse if you're quiet?