I use to be like you I would chew and chew my nails most of the time until they would bleed or hurt I did it for 21 years ..So,i finally got like you and wanted nice beautiful nails that everybody except me had so I started going to the salon and getting them done problem was I couldn't really afford it.So I started learning how to do them my self the products you need to how they do it and got up the courage to do it my self when i first started they where horrible but I just kept trying and trying I ended up getting it down and now today 2 yrs later I'm going to school for it and doing gels,acrylics,pop its,glitter,etc.  and i do not chew my nails and have a beautiful free edge that gets dirt and stuff stuck in it laugh weird feeling for the first time..Don't waste your money on those stop biting paint on nail polishes,painting them don't work either they waste your money anyway I hope this helps and shows you with the right products and determination you can also stop biting your nails.