At school, I couldn't speak audibly/articulately, especially in front of a group. When my turn came to read in front of class, people would tell me to speak up. I felt like I was yelling, but they still couldn't hear me. It was stressful, and it only made me more shy. These days, people don't ask me to repeat myself, so I figure they can hear me fine.
Though I'm definitely an introvert, my behavior around those I'm close to is noisy and melodramatic. Yesterday, I mentioned it to my mom to see if my perception of it was right...
Me: "Hey, I was thinking the loudest person in our family—"
Mom: "It's you."
Me: "—is me. Wow, you didn't even have to think about it.

"
I'm the one who embarrasses my family by laughing and speaking too loudly in public. When I feel safe with people (and I only feel that way with my family), I have less of a filter. I talk too much and too loudly. Everyone else gets my medium or medium-low volume. Lucky them.