I think im really depressed...what do i do?

Well my life sucks so i doubt it hereditary for me. i took loads of test online and it said i have major depression, i have all the symptoms (ive done research) i just havent gotten any help. i self-injure, i have a lot of suicidal thoughts, my parents know nothing about my depression and its getting worse.i hate going to school too for the same reasons including hanging out with my friends because its just not the same anymore. when i smile im like wth am i doing here? im not happy like them. depression should be taken seriously, though i hardly can give you advice because the only way i see "out" is by death. i hardly think that meds will help me. Just dont give up. i'll try not to as well. Good luck.