I gave myself electric shocks to quit biting my nails — it didn't work

I’ve been trying to quit biting my nails forever, but all techniques have failed. If I apply nail polish, I leave my nails alone but I bite my cuticles. Then when I remove the nail polish, I’m back to square one and the nail biting resumes instantly. I even tried that bitter-tasting nail polish that’s supposed to keep you from putting your fingers in your mouth. A waste of money.
Believe me, I want to quit. I find nail biting disgusting, especially because I live in New York Ci