I feel ya. I had the advantage of being really good in extracurricular activities so not many teachers were annoyed with me, but there were few specially the female teachers. But I have quite a good number of people who enjoy being in my company and find me funny. As you said, it's natural we can't help it. I have tried many times to tone down but unknowingly the pitch increases added to it I am very talkative too. So I annoy quite a lot of people around me. But I am happy the way I am and don't care about the people who don't like me, apni dhun me kush. Btw, I had real tough time when I had first met my to be mom in law and had to spend time with her the whole day.
I dont understand why must someone hate the the other for being so loud. Some of my friends are so loud. Lod meaning really loud but they are most trustworthy friends in my gang. I can share anything with them & they are also the sweetest persons i know.