How to deal with depression?

Lately I've become depressed. I used an app to take a test a few different times. Twice it said major depression. Once it said dysthymia. Either way, I figured it was a little confirmation of what I'd expected. I'd really like to see a therapist. I am not concerned that this is abnormal. Just feel id benefit from therapy. I want help while I'm still the way I am. But I'm 19 and still under my parents insurance. And I don't want to tell my mom. I can't. Her mom and sister were both kind of crazy her whole life and had depression and bipolar. Whenever I exhibit similar signs she says things like "don't be" or "you're not gonna be" like them. So I can't tell her this. And I cant afford therapy. What can I do? I've spoken with friends but it honestly hasn't hardly helped at all. Not with my boyfriend, best friend, or a friend that has been through it too. I'm just going In a bad direction.