You must tell your parents because they love you and will do anything to help you. You need to be seen by a Pdr. and put on meds. I know this because I myself was severely depressed and was hospitalized twice in the last year, & 8 years ago, my daughter had a breakdown but we never knew how long she had been depressed or even that she was that bad off. Her best friend told us that our daughter was thinking of killing herself. We immediatey found help for her, and she is thriving now as a young woman. There is help out there and the first people who want to help you and can help you are your parents. Please let them know what's going on with you asap.