How do i tell my parents and friends that i want to die and that they should be happy im gone ?

i suffer from borderline personality disorder , major depressive disorder and generalized anxiety disorder. i want to tell my parents and friends that i see no cure for my illnesses and just want to die. about two weeks ago today i overdosed on my prescribed klonopin while at school , i called a crisis worker and her and a cop showed up to my apartment door . i was on the phone with her and said i wanted to take my pills , by the time she showed up , i has taken 10 pills plus the 2 i was normally prescribed. they called the ambulance and i was taken to the hospital where they told me to drink charcoal and where i was going to get a psych eval. well i was never seen by the doctor and they send me home. well around 12:00 am i was still feeling sad so i called a crisis worker again and told her i wanted to keep taking my pills. she said i needed to go back to the hospital so i went and as i was waiting in the er i took about 5 pills and was acting strange infront of the nurse. so they put me back in the psych unit and i talked to the doc where i said all i wanted to do is go home, she said she couldnt let me go and threatened a 302 ... well the same crisis worker who saw me the night before was called to do the 302 and convinced me to just sign my self in. well i was put in a shitty facility and after 2 1/2 days i begged the doctor to let me go home convinced i was fine. well i wasnt and i still wanna die. i am tired of all the pills , the appointments and nothing is working. that is not how a 21 year old should live and im on the brink of filing for disability because i cant stay stable enough to get a decent job. im tired and just want to die so how do i break the news to my therapist , doctor ... and find a decent way to tell my parents how i feel and that this is the only cure for my illnesses.