When I get very stressed I often start cutting on my hair and in the past went from but length to chin length over a few months from cutting my own hair. Then I would realize what I did and freak out and have a nervous breakdown (I think the cutting of my hair is a sign that my illness (Bipolar, Anxiety, PTSD) is flairing. I get an urge to cut and color and do all kinds of things when starting an episode. As you are avoiding studying to do this activity I do believe it could very well be a stress reliever for you and a coping mechanism. If you don't mind and think you would never mind being bald them continuing to pick at your hair will have no consequences....but if you do care and cannot stop them you will end up with that long hair that I'm sure took years to grow gone. (((Hugs)))