Jim Carrey Online

I have this guy who lives in California that is stalking me, getting close with my friends, and is trying to copy my entire life.

How do I get rid of him?

Have you tried to contact your local police department and make a police report? (If he is really stalking you.. )

Just Do not threaten the stalker cause He would just think that's a joke.

Contact the police. It's the best option and don't try and talk with him.
He will think you're reaching out.