Does it still count?

... I always thought depression is something people have as a default brain setting due to chemistry, not because external circumstances...

I just scored 52 on the depression test and won't take that as Life Truth and focus on it - but I answered truthfully and the heaviness stems from a decade long situation I cannot change ... does it still matter?
I am, in general an easygoing person, I'm on the quiet side with bursts of extrovert moments in comfortable social settings, I feel happy and blessed in so many ways and am, in general, happy with many things - but the unchangeable issues make me feel like a failure and so singled out and I have never been able to fit in, since I started remembering myself (but that's cause I was always the chubbiest in my class and didn't have money for anything) ... so, I never thought I would actually have depression - I enjoy so many things and am happy about things, just the overlooming issues weigh me down (and I'm also afraid of everything from social settings to hights).
Maybe I should look into some self-help stuff?
I don't even know if I fit here ...