ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'db'

I want to begin writing queries in MySQL. `show grants` shows: ```lang-none +--------------------------------------+ | Grants for @localhost | +--------------------------------------+ | GRANT USAGE ON *.* TO ''@'localhost' | +--------------------------------------+ ``` I do not have any user-id but when I want to make a user I don't have privilleges, also I don't know how to make privileges when even I don't have one user! mysql> CREATE USER 'parsa'@'localhost' IDENTIFIED BY 'parsa'; ERROR 1227 (42000): Access denied; you need (at least one of) the CREATE USER pr ivilege(s) for this operation I tried to sign in as root: mysql> mysql -u root -p; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'mysql -u root -p' at line 1 mysql> mysql -u root -p root; ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'mysql -u root -p root' at line 1