This sounds like a permissions issue. Something went wrong at some point, which changed the permissions or the ownership of your $HOME folder.
Let's assume both, just to be safe.
You can use the chown command to change ownership. Permissions can be changed with chmod.
You must use your $USER account name that you created when you installed Zorin OS. $USER is the generic stand in used for relaying how to type a command (since we do not know your account username on your computer). Always replace $USER from a generic command with your actual username.
sudo chown -Rv $USER:$USER /home/$USER/
find /home/$USER/ -type f -print0 | xargs -0 sudo chmod -Rv 644
find /home/$USER/ -type d -print0 | xargs -0 sudo chmod -Rv 755
This should change ownership of your home folder back to you and change all files and folders access back to you.
Swarfendor wrote a manual, here: