Here's a simple way to hack this:
The default user profile is located at /System/Library/User Template/English.lproj. On the command line, and NOT while logged in as yourself (either connect via SSH remotely while logged out or use a different administrator account):
Remove your existing account with
$ rm -Rf /Users/myshortusername
then copy the template back with
$ ditto /System/Library/User\ Template/English.lproj /Users/myshortusername
(make sure to omit the trailing slash!)
and finally chown the copied account back to your user with
$ chown -R myshortusername:myshortusername /Users/myshortusername
You'll need to be root for this, so either $ sudo -s
at the beginning or run each command with a sudo.