TGM lets you stay a werewolf as long as the code is active, you have to turn it off to let the countdown continue to go back human so essentially, you could play as a werewolf most of the game. If you don't want to cheat to become a werewolf, the Companions quests will let you become one.
i know how to cure others of ther werewolf blood, but how do i cure myself?
It may be a spoiler so you are adviced!
To cure yourself you need 1 head of the witches that you hunt during the missione to cure the leader of the companions, then you go to the cave of whatever it is (the one with the dead spirit of the leader) and you do the same ritual to cure his spirit but this time it ask if you want to cure yourself.