Bad habit

I have various bad habit. One is jiggling my knees. I want to stop this habit the most. Other habits are sitting on the chair with my legs crossed, leaning elbows on the desk, waking up late, sitting up late and eating fast. I don't like these habit so I ask my friends to give me some advises to stop them. Because these actions give people bad impression and some of them are bad for my health. One of my friends said that it would help to stop jiggling my knees by binding my knees. I will live up to this advise.