I'd persevere. Bear in mind that at university you will be put in a lot of new situations that may feel uncomfortable at first, and adapting to this will help you along the way to that.
Just remember that nobody in the class is there to mock you or belittle you, a lot of them are probably just as anxious (though I'm sure there will be a few pompous ones, there always are).
Give the course a go, it can't really do any harm.
I've had similar problems in the past, particularly when it came to French essays and such. Practise reading them aloud to yourself, if you can. Also, I know this isn't the best advice in the world, but what I found easiest when doing creative writing in French was to not pour my soul into the first piece of work, and to gradually show more and more of my true nature as a writer as I gained confidence. It is unlikely that anybody will criticise you in a non-constructive manner.