Why Admit a Higher Power?

Why is it so important for people to admit that there is a higher power? To me it would be depressing to say this higher power wants to fuck up my life. For me it is liberating to know that I am in charge of what goes on in my life. I really dont understand why AA has to admit there is a higher power. I know that the power doesnt have to be a god, but still. I dont understand how that is helpful. Does that mean you have to let go and say you arent in charge of your disease? I dont get it, but if it helps people than awesome.