Wattpad is the platform where you can freestyle your story and share it with everyone. It is also another form of a brain dump and expressing your ideas on a piece of paper-kind of your morning journal but in the story form. 

I always have a lot of stories created in my mind and daydream about how each character will look, move, emotionally and react to the situation. My only hinder was my grammar and vocabulary limitation. Whether the audience understand what I'm trying to portray, or do these words sound appropriate?

That does not stop me from improving myself and still scribbling the ideas in point form. Just improve yourself to be a better self and don't stop doing something you like or love to do. Cheers!!!