Even if you are a beginning writer, you shouldn't ask for people to go easy on you. Constructive criticism is how you learn to become a better writer.
Hi Cube Boy. While there are quite a few younger people on the site, I would advise that it isn't exactly "child friendly". I'd say always check the age rating for any games you read, and probably best to avoid the forums all together since there is a lot of strong language that probably wouldn't be suitable for a 12 year old.
That aside, hope you enjoy the site. ^_^