Is it normal to be extremely sensitive to sound?

Aren't most of us like this? Or, am I just in denial?

I am run by herts. One second at a time. Just unluckey I guess. Or yep I am around something I cannot proove or do anything to even try and better.

Me too, I can't stand the sound of screaming children, From outside! It's drives me nuts.

I have something similar- it's called Hyperacusis. Some days are better than others. Sometimes it's only certain frequencies that are painful, while other times it's pretty much everything.
Of course, I don't know what your specific instance of this is or what it's caused by. Mine's been diagnosed as idiopathic, but sometimes people get similar symptoms from minor hearing damage, which sounds counter-intuitive but is a common cause. Also, people on the Autism spectrum seem to be more prone to developing hearing sensitivity.
You should do a little research. Sometimes there are simple fixes like wearing noise-cancelling headphones when something's really bothering you. If nothing else, a trip to your doctor may be in order to help you figure it out.

It's very normal. I have that problem too. I can't focus on my job, and sometimes I get headache.