Depression

I can honestly say I’ve been writing suicide notes since I was at least 9 or 10 . I’m 17 now . In my life I have honestly been through a lot . I’ve been hospitalized maybe 3 times . I’ve been molested , raped , and taken advantage of .I wear jackets and long sleeves all year around because I have self harm cuts on my arm that are very large . Idk why I am always sad , I’ve always been sad . I’ve saw numerous of therapist and nothing works. I barely go to school because my depression is taking over my body ! I really don’t talk to my parents about it . I feel as if I need medication for this , but i heard that it makes you worst . Can someone please offer me some advice