I am very quiet. Grew up in a quiet house. Pre-kids we were a very quiet couple. That changed the minute DS was out - he started wailing and didn't stop for the first year and a half. The hospital staff told us that kids who cried as much as him were hotlisted in their pediatrician files as potential abuse victims because it was so stressful on the parents. He screamed full-on for a good 12-16 hours a day minimum from newborn onwards - typically more like 18 hours. I lost hearing partially because of always pacing around with him screaming in my arms.
Now 4, DS is still a screamer. Except he doesn't cry much or anything - just that everything he says comes out in a scream. We basically had to move out of our apartment because he was too loud. (We weren't forced out but my social anxiety just was too much and the neighbors were always complaining about us and why we don't try to "control" our kids... When all day we did try to.) He has SPD and needs everything to be loud and intense. He and his sister scream all day, every day. Pretty much every day ends with me in tears over how loud they are. When we're in public I try to grin and bear it (well, with constant reminders that they tune out by now to hush) but everyone always comments on how much they talk. They literally never stop. They even talk in their sleep. I timed how long it was quiet in our house even after I specifically told them we have to be quiet now - it was 30 seconds max. We suspect DS has ADHD - his EI therapists said as much but he was too young then to diagnose. Even when he tries to whisper it comes out as a scream. We tried to go to an exhibit at the zoo that asked for quiet - there were like two dozen kids his age there, being quiet - I explained to him why we had to be quiet, the monkeys were sleeping, etc. He screams, monkeys scatter, moms and kids glare at us for frightening them away. Rinse repeat at like every other exhibit practically.
They also run instead of walk. No matter how much we tell them not to. Jump on furniture. Jump just any time. Roll around the room for no reason. Cartwheel. Tumble. They'd swing from the ceiling fans if I let them. On the plus side they get tons of exercise. They're physical. Both learned how to swim within three days of being around my mom's pool. But on the downside there is no controlling them physically. You can't get them to walk. Not even if you give them reasons. Consequences don't make a darn difference. I just gave up a while ago. They won't sit in the bathtub, they won't walk around the poolside, they won't follow basic safety instructions. I feel like a failure but it's really, no matter HOW many times I tell them, quietly, loudly, with a "if you don't sit down you can't play" or whatever... they won't comply. Or they will for 30 seconds and then not. When DD is by herself she's fine, but she copies him, and he really doesn't seem to be able to control himself in any way. I'm pretty darn sure that it's ADHD. It has to be. Diet doesn't make a change, by the way.
My voice is now harsh and shrill from having to scream over them all day. It's demoralizing. If I talk in a normal volume they don't hear me. If I try the "whisper to them" trick - it doesn't work. They are always screaming, screaming, screaming. And then DH screams at me to stop screaming at them all day and then the kids cry because daddy is screaming, and it's just a nuthouse half the time. I'm so glad we're moving to the country cos there maybe they can be as loud as they want to.
I'm an introvert too and it's just so draining to me. I specifically deprive myself of sleep just so I can have an hour or two at night to recharge when everyone is sleeping, just so I get my quiet time. I need it. I need quiet time like I need water. Seriously.