I used to bite my nails quite badly too, and I hated it, I'm convinced they grew overnight but obviously not! As others have said I found putting nail polish on them really helpful. Even if your nails are short, you can put a colour which is similar to your skin colour so it isn't as obvious. Then when they have grown you can go wild!
I never found the horrid tasting polish that helpful, I must have super resilient taste buds, but that can work for many people. It can also help to ask others to point out when you are biting your nails to help you stop yourself when you're unaware of it.
When you're feeling as though you don't fit in, could you try a stress ball, or fiddling with some string etc. which has a similar effect on biting your nails.
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