To make the directory issue:
Then attempt to mount the drive, after mounting the drive you will need to use the
chmod command to assign the appropriate permissions or
chown to make yourself the owner, whichever you feel is appropriate.
However you will need
sudo to do so.
You said you are unable to use
sudo but then go on to state you are the administrator. What is the output when you issue
sudo su and press return and use the password for your user account?
EDIT You added a comment you are able to use
sudo so does this eliminate your problem? Are you now able to mount and access the drives as you want?
EDIT 2 Try this -
sudo chmod o+rw,g+rw,o+rw ~/newDirectory
sudo mount /dev/sdx ~/newDirectory
cd to your new directory and see if you are able to access the files