Wait --there is one more important before OP will vanish his account.
-Delete all your posts that can be found on your post history.
It's not necessary to do.
If you have secret and don't want anyone to know, don't publish it on Internet.
A Bitcointalk member only can delete posts but can not delete a thread, opening post of a thread. Even posts if deleted by OP will still be stored by some scrapers.