I need to get over depression.?

I've been depressed once before but summer vacation relaxation recovered me. But this year has made me depressed again. I've been cutting. I've read some things saying I should go and hang out with friends but my parents don't allow me most of the time but hanging out with my friends is the only thing that distracts me from how depressed I am. I don't want to tell my parents about how I feel because then they'll stalk my texts, e-mails, instant messages, phone calls, everything. (I've gone through it before.) And I can't go to a therapist without telling my parents. (I don't want to tell a stranger my problems anyway.) I pretty much hate myself and this has been going on for months now. I tell my friends about my depression and stuff but I don't want to anymore because I'm starting to bring them down. Please help me.