Doctor please help me I'm nail biting I have try...

We would like to inform you that nail biting is a psychological condition that usually affects a person and activates it when he is in a state of tension, anxiety or excessive thinking, or a person may resort to it when he feels tired and psychological stress without awareness or awareness, and quitting this habit requires you to be convinced of the negative effects of this problem and behavior by distorting  Your nails, and affects the appearance of your teeth, as it distracts you from carrying out your daily activities, as well as taking into account that the treatment depends on you yourself to empty your negative charges, energy, tension, anxiety and excessive thinking through sports, deep breathing, writing and other methods, fill in your day and free time with activities that occupy your hands, and you can also use nail polish or artificial nails as a start to get used to not biting your fingernails, and you can also talk to people who have had this problem and quit it and so will help you get rid of it, try to set yourself a deterrent method or  punishment by hitting your hand whenever you want to bite your fingernails and after time you will find that you are accustomed to gradually abstaining from it, but you have to maintain the determination towards stopping that habit.