I started biting my fingernails in first grade because my already chubby fingers had to be made more disturbing to look at. It’s not like I didn’t want to stop, I just couldn’t. The biting happened sort of unconsciously (that’s a no brainer) without me making the decision but I eventually was able to reduce the biting to a minimum and only ever disrupted my nails and their appearance when I got stressed. Truthfully though, with exams every other week it was sort of a constant state, even if not as bad as in the beginning. As you may know, or not know, I was an exchange student in the US for a year and well, things changed.