I started picking as a kid too. It was mosquito bites, owies if I fell off my bike, anything. Then in my teens it became acne, and I have the scars to prove it. At my age, I still get acne from time to time. Two years ago I got a rash on my arm. The doc doesn't know what it is. I pick at it and won't let it heal.
What about tweezing. I started on my eyebrows when I was 12. They're not too teeny, but I have to pluck every day forever and ever.