How do you quit a drug addiction?

I'm addicted to drugs I won't say which ones or my age but I'm an addict and it's ruining me and every relationship I have.
Please does anyone know what to do to get rid of them?
My parents don't know yet and I'd like to keep it that way so if there's a way that won't involve them that would be preferable.
How do you quit a drug addiction?
Post Opinion