I'm going to confess since I know I'm wrong
Why do you feel the need to confess?
My whole family is so messed up that I can't even live in peace in my own house.
It's good that you recognize that you're in the wrong and that you're willing to take responsibility for it. Knowing what you did wrong is the first step to improving and making things right.
I know only crying will make this all go away
That doesn't sound like owning up to it. If you feel the need to cry fine, but you shouldn't expect that to absolve you of your sins.