How do we know when we are depressed?

BornToDiee
I feel like my mind is being invaded by negative thoughts. I feel like I've lost my purpose in life. I am afraid and worried about everything. Living doesn't make me very happy. I feel like I'm worth nothing. I feel like my existence has no value to this world. But I don't want to feel like this. Sometimes I don't want to do anything, sometimes I feel very tired. Am I likely to be depressed? Or am I depressed?
How do we know when we are depressed?
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