My user name is >Removed< some body using my gmail id with out my permision so I want to block my gmail

my user name is >Removed< some body using my gmail id with out my permision so i want to block my gmail

You don't, you abandon it. Google owns it... not you.

Next account you open... use a real password that's not a word, o name... and uses upper and lower case letter, some mubers and at least one special character, and write it down someplace in case you forget it.