If I talk like people in Pride and Prejudice, will people laugh at me?

First, I’m an English learner. It’s not my first language.
So I ask the above question.
One of the biggest problems I face each time I pick up a movie
to study English with is that I don’t have enough experience to tell whether or not the way they talk is realistic in real life..
Of course I know English in Pride and Prejudice sounds a bit weird,
but I need affirmation..
By the way, do you understand everything people say in that movie, without fast forwarding back?