Is there any similar websites like wattpad?

There aren't any websites which are exactly like Wattpad.

One website that is similar to Wattpad is Fanfiction.com. You can write and read books and people can write their own versions of books (Like their own version of The Hunger Games, Harry Potter, twilight, etc.) You can also fins mash-ups of two books ( Hunger Games + Harry Potter)

Other similar websites are:

FictionPress

Mibba

Writers Cafe

Booksie

Figment

Penana

WorthyOfPublishing

Bzoink

Quizzilla

Quibblo