I feel worthless, sad.help me?

i feel very sad and worthless. i had always been a nice girl . every one expected me to do great. but right now feel my badluck has really taken over. i cant get admission to a good college. my boy friend broke up with me. i dont even have much friends to be with. my parents are far too busy!! I'm getting into depression i guess. i dont wanna do any ay thin. just feel like..hibernating for days