I'm hoping that it's a relatively new install and if you delete everything under /home/USERNAME it won't be missed, so do the following:
When logged in as root, type the following:
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userdel USERNAME
groupdel USERNAME
usermod -G USERNAME USERNAME
rm -rf /home/USERNAME
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Now that will have removed your username, usergroup, affiliations with other groups and everything under and including /home/USERNAME
Now to add it all back again:
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useradd USERNAME
groupadd USERNAME
usermod -G USERNAME USERNAME
usermod -G users USERNAME
mkdir /home/USERNAME
usermod -d /home/USERNAME USERNAME
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That then creates your user account, and the group for it, gives the group user rights, then connects your username to your group, makes your home directory and joins your home dir to your username.
Hope i have helped...... if there any errors in what i have told you - try google, it is fairly general linux stuff, but i';m not in front of a linux machine, so it may not be 100% accurate - but it looks fine to me
And of coruse throughout the whole thing - replace USERNAME with your login name - ie John, or in my case - dickohead