unable to create database in mysql or via ssh

I m trying to create new database through mysql or ssh but on both m getting error

mysql : CREATE DATABASE porto;

Error : Access denied for user 'root'@'localhost' to database 'porto' on ssh : ERROR 1044 (42000): Access denied for user 'root'@'localhost' to database 'porto'

mysql> CREATE USER 'testuser'@'localhost' IDENTIFIED BY 'ecomaddon@42';

ERROR 1227 (42000): Access denied; you need (at least one of) the CREATE USER privilege(s) for this operation

mysql> SELECT User,Host From mysql.user;

ERROR 1142 (42000): SELECT command denied to user 'root'@'localhost' for table 'user'

Its problem of privilege but don't know how give root user all privilege ai had try all methods but got nothing.