It is highly unlikely your account will get deleted.

For starters the only person that can do this is admin.

Deleting is generally not done on this type of forum. If you were to delete your account, then is it likely any thread which you have participated in; will then be missing your posts.

This would then cause the DB to get all messed up.
For example a thread could look like a current member is talking to him/herself, or worst important data in a post could be lost.

If you no longer wish to use an account then simply don't use it.