Create your folders again and use this command first:
After that, you can define your main folders correctly. Edit the lines for your case and save file & exit. You will see a document like that:
# This file is written by xdg-user-dirs-update
# If you want to change or add directories, just edit the line you're
# interested in. All local changes will be retained on the next run
# Format is XDG_xxx_DIR="$HOME/yyy", where yyy is a shell-escaped
# homedir-relative path, or XDG_xxx_DIR="/yyy", where /yyy is an
# absolute path. No other format is supported.
If it is necessary, you can reboot your pc.