We’re always disappointed to hear that someone hasn’t found what they're looking for here on BHW.
You can of course close your account. The way that we do this is to ban it, which means that no other user will be able to find your profile or contact you through the forum.
To ask for this to be done, log a support request and follow up with a PM to verify that you own the account - we will do the rest.
If you wish to have your account reopened after having it closed, you can also request this through our support portal. The request will be reviewed on a case-by-case basis