Lots of them.
I used Booksie for a couple of years. It was a good place to get feedback on the first draft of my novel.
But do realise that you'll have to be willing to read other peoples' work and give them feedback if you want them to read yours.
Good luck with your writing. It's a fun thing to do. And re your lack of confidence: You'll be surprised how quickly you improve when you get into it.