How can i stop a habit of biting my finger nails and the skin on the end of my fingers? ?

Im trying to grow my nails and make them look decent...ive got like no nails and the end of my fingers don't look too good iether.





Is there anything i can eat to make nails grow faster too?How can i stop a habit of biting my finger nails and the skin on the end of my fingers? ?
Perhaps wearing gloves might help.