I'm very quiet too, the most untalkative in each group I am. Some people say I'm nice, other people ask "Why don't you talk?" and almost always I respond: "Because I don't have something to tell you/us"
When I was in high school, there was a girl that told me "You are very nice, but before I knew you well, I thought you were a selfish as*hole, cuz you didn't talk with me.
But I had a different experience when I was 12. I met a woman that my parents knew. That woman made me a lot of questions about me, because I was very quiet. Time passed and, one day, I did something wrong, something that a NT would never do it. My mom scolded me, and she told me:
"Do you remember Mrs. Palomo (the woman)? she told me you probably had a neurological disorder cuz you were extremely quiet with her. I told her it was your personality. But with this action, you are making me to believe what she said".
As you can see, Mrs. Palomo had the reason, but my parents didn't accept my situation. So, I think NTs can interpret your silence (or talkativeness) in a different way, but if they are intelligent, they will discover you are a great person