User only categories

Hey all, i am trying to make it on my website where only some categories can be seen by users who are posting material. So as when they log into my site and go to post a piece of work there are only come categories that show up to them instead of all of the categories that I have created.
Anyone know of a fix for this, I prefer a widget. I have been doing some research and haven’t found anything yet.
My website is http://www.unpopularcomic.com