Plz help with my nails

So, I’ve been getting fake nails lately. With the tip glued on and then the dipping powder to form the nail. Ive soaked them off in acetone every time I’ve taken them off. But my real nails have been sooooooo PAPER thin, that they split right down the middle which results in them tearing and then I start biting down to where it almost have no nails left. I’m a nail biter anyway but never this bad or this short. They’re just sooo thin. HOW can I fix this?!? They’re soo ugly I’m embarrassed. I wanna go get them covered back up but I know in the long run that won’t help or really fix anything and will just continue to make them bad..and it’s painful. Do you think they’re ruined forever?!