Want me dead

I wander what you'd do without me
Not have to worry about me
You laugh so you don't cry
You're scared when I'm not in line
I'm crazy but I manage
Good and evil marriage
Everyone's favourite menace
I was the one in my head
The one I see in everyone's face
The demons that hunt me
They need me, they want me
I will laugh in your face
Take up your space
I will love you so bad
You'll want me dead.