Contrary to what the Discovery Channel may tell you, sharks are not nearly as dangerous as some other common features of life.
Foreign Policy has a list of 10 things more likely to kill people than sharks. Topping the list are death due to being crushed by a television, riding lawnmowers, being crushed by a vending machine, and having a fatal trampoline accident.
So don’t worry too much about sharks. There are much more dangerous things around.