Is your name
Ben?
I just looked at this wiki page and saw that July 11 – The chimes of Big Ben ring for the first time in London.
The other sentences seem to match, too.
My nationality is English. The Big Ben is located in London.
I am born at 1859. Its construction completed in 1859.
I am bald, but I've never been bothered by it. As a bell, it has no hair.
I have always been on the round side, and people don't hesitate to point that out. People say Big Ben, big can mean one is on the round side.
Throughout my years I've always been pretty loud. Being a great bell, it is quite loud.
My name is simple, nothing tricky here. The nickname "Ben" is just so simple.