Is there one way to be sure about having depression?

I think I have depression. Is there one way to be sure about it? I haven't said anything to my family because I'm not sure. Also, I would prefer not to go to theraphy or to a psychologist, because I don't want my parents to waste money on me... I've seen multiple posts on the internet that I can... show more I think I have depression. Is there one way to be sure about it? I haven't said anything to my family because I'm not sure. Also, I would prefer not to go to theraphy or to a psychologist, because I don't want my parents to waste money on me... I've seen multiple posts on the internet that I can relate to and didn't know happened to other people too, and in the comments there's people that say "Hey, you know that's a symptom of depression right?".
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