7 Day Challenge?

I started picking when I was 14. I'm 17 now, so it's been three years. The picking has gotten progressively worse the older I've gotten, to the point where I can hardly go one day without picking. My face is a mess. It's covered with scabs and bumps from the constant picking. It's making me really self conscious, and some days I get so embarrassed about it that I stay home from school. In the summer I try to avoid going swimming with my friends and other fun water activities because I'm afraid my makeup will wash off, and everyone will see whats underneath. With summer almost here, I really need to try something to make myself stop. I don't want to miss out on everything again, and I really do want to see my face clear up for the first time in three years. Anyone interested in trying out just seven days? I need to start somewhere.