If you want to not receive PMs from certain people, you can block them under your profile settings by going to "Personal Message Options." If you want your gallery images to disappear, you can delete them. If there are any posts you made you don't want people to see any more, you can delete those too. If a poster is harassing you, report them. If a moderator is harassing you contact Nym or one of the nicer moderators. If you don't want to be here anymore, log out and don't log back in. How is that?
Shua, please don't act like you don't understand my intentions.
The Facebook options on blocking people is exemplary; if I write a comment or start a thread, respectively, I don't want some certain users to even know I've written it so that they can't comment on it. The ignoring option (which I also know from other forums) is completely futile. And you do know that!
This is an open forum not a social media website, so no, that isn't possible to only allow some people to see what you've written.