Bad habits are things that are gross or not acceptable in public. Some examples are nail biting, nose picking, hair sucking, thumb sucking, etc. There are ways to try and get rid of them.
Nail biting: keep hands busy at times when you are bored(sit on hands?) or there is a special nail polish to keep you from biting and finally you can ask your mom or do it your self to clip your nails every few days.
Nose picking: keep hands busy:sitting, tapping,etc.
Thumb sucking: keep hands away from mouth or keep them busy and when sleeping, keep hands away from mouth and there also is a special thing to put around your thumb to make you stop.
And most of all............... have perseverance! if you try really hard to reach your goal it just might be achieved!