Most of the guys that I know won't really make an effort to "pry open" a quiet girl's personality to help them break their shell. Granted, these aren't all guys, and I'm a girl.
People might mistake your quietness for a lack of self-confidence, a major insecurity, or some other thing.
My suggestion is to just chat it up! I talk a lot (you have no idea), and while it bugs a few people, it entertains a lot of people, and I have tons of friends because I talk a lot.
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