We can decativate an account but not delete it. Well, an accound can be deleted, but it will remove all posts by that account, which can leave threads looking disjointed.
As other have said, if you no longer feel this forum is suitable for your needs, then I would advise simply not logging on.
It is a shame that you feel this way, and I would assume it is not something that in your view has happened overnight. To that end, this suggestions area is here for a reason, and as we have said before the team running the site have never done this before, so any suggestions or ideas on how things can be improved for all or for individuals would be welcomed if people feel things are not right.
I do hope you would reconsider, and perhaps help us put right the isues you feel need adressing, but if not, if in the future you feel you want to take part again, please do not hesitate to do so, if you need your account reseting at that time just let us know.