To cope, life can be stressful and drugs relieve stress
Family dysfunction, drugs might make you feel better when your at home life is off
Abuse, even if it is emotinoal abuse you want to find something to take your mind off it and because of the effects of certian drugs they help to do so.
Pick up things like exersising and staying away from images from the media that might alter your image on what your body should look like
Learning to say no to people will help you in the long run along with surronding yourself with people who make the right choices would be better and healtheir for you as a person.