Tried to talk to my sister about my depression an she couldn't have cared less, what did I do?

I'm 18 she's 17

Me: I've been feeling down for a while.
Sister: Okay
Me: Well I went on the net to see how deep it went, and I ended up taking some tests all of the results came back saying I have depression.
Sister: It's a lie because internet tests don't work you knob
Me: Well my friends recon that I do and one of the actually has depression or at least bipolar, Thursday night I burst into tears for no reason and thats the second time it' happened.
Sister: YOU ARE NOT DEPRESSED
She then tells me to get out.
Tried to talk to my sister about my depression an she couldn't have cared less, what did I do?
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