I'm not particularly talking about people raising their voice when speaking (I'm sure I've been guilty of this too). It's more like justafriend said, shrieking or yelling without words. I usually see it when they are horse playing with their friends. Or they shout "OH MY GOD" at the top of their lungs. All while jumping around, sometimes on top of eachother. They also like to blare their music loudly.

Your situation sounds very different, and understadable. I have the problem where I speak so quietly that people have trouble hearing me. And I'm terrified to speak to people. I would say so long as you don't regularly scream "AHHHHHHHHH" at the top of your lungs for no reason, it's all good.

Side note: I think my social issues are the reason this bothers me so much. I feel awkward around people who are flamboyantly extroverted and social, because I don't understand it. It's like, do they ever just sit down and have a regular conversation with eachother? If not, wow.