I severely pick my nose?

Ok, ever since I was 5 I've been an avid nose picker...it's just normal to me. I can't stand feeling boogers in my nose and a lot of the times I catch myself picking when I'm nervous, upset, whatever. But in the past few years it's gotten to where I pick my nose, and if there's not boogers in it, I pick the skin. I don't know if this is damaging it badly? This is obsessive, it's more than a "just carry around a tissue and et used to not picking it" thing. How do I stop this? And is the skin picking really damaging my nose? I wouldn't doubt if there was scarring.