Any ideas on how to tell family/friends....?

I've had dermatillomania ever since I can remember, though I never quite knew what it was called until now. I mainly pick at my gums, though I also peel the skin off my lips as well. I've tried before to stop myself on my own, but it obviously hasn't worked very well or I wouldn't be here now. I'm turning fifteen in June, and I'm a freshman in highschool. I'm sort of embarrassed of my dermatillomania... though this probably isn't very surprising or uncommon, hmmmm? Mostly I keep it hidden pretty easily, and if anyone's noticed they don't say anything about it. I like to think that no one's noticed, though. However.... I've been seriously thinking about stopping myself from picking at my gums and lips. And, especially at my age, I don't believe I can do it without the support of at least my parents. So does anyone have any good ideas how I tell them? Do I just go, "Hey Mom, do you know what dermatillomania is? Because I have it." Thanks. :D