I'm your tool

I'm your weapon,
I'm your shield,
I'm everything you ever need,
I will protect you cause i love you,
I'll die for you if i have to,
I'm your tool,
I do everything you want me to,
Most people think i'm crazy,
But it's what i want,
I live for you,
And i'll die for you,
It's the only way to mean something,
You're very precious to me.