Hi Jesika,
I used to bite my nails too (pretty much from birth til age 16). In my teens I discovered "Sally Hansen's Maximum Growth" nailpolish system at the drugstore one day on a holiday to California. I followed the program exactly for the 10 days they said and came out with beautiful long nails. I never again bit my nails, they looked so purdy.
You could give the Sally Hansen's stuff a try.
Or, you could go get your nails done by a pro.
Perhaps enjoying the nice nails look will help you avoid this habit.
However, fake nails can wreck the nail bed.
There are also some nail products that taste bad. You could try that.
Puts a bad taste in yer mouth every time you go to chew.
I've never tried that, so I'm not sure how effective it would be.
For dramatic effect and shock value take a picture of yourself chewing on your nails and one not chewing on your nails. Ingrain this into your mind.
Alternatively, and perhaps more effectively, you could go see a behavior therapist.
They can offer help "i hear" with changing deeply ingrained unwanted habits.
Most importantly, give yourself permission to do some positive caregiving to your hands.
Perhaps giving yourself a manicure every week or even every few days would help to re-wire your mind on this habit. Spend time painting your nails, even just clear colored if you like the natural look. Remind yourself that you deserve ta look purdy and feel good about yerself and your hands and nails.
Good Luck. I know itz tuff to change habits like this but You Can Do It!
SPAZ