Do you have any moments of absolute happiness where you feel really happy? Do you feel constantly bad with moments of absolute awfulness? Is there a theme that keeps appearing about what you think about when sad (e.g. do you keep thinking about your academic failures? Your past?)? Do you self-mutilate? Do you consider suicide?
Honestly, depression is a broad subject so it may be beneficial to find out possible causes and deal with it appropriately.
Honestly, depression is a broad subject so it may be beneficial to find out possible causes and deal with it appropriately.