Hello, Tiggy4! I'm not surprised your life experiences have shaped the way you personally experience depression. Depression is not a one-size-fits-all illness.
Especially considering you have a life-long history of bereavement / abandonment, seeking professional help could be of great assistance (I realise that's not always possible or practical).
I join everyone here in wishing you close, affirming, stable relationships.
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My dog

mastered the "fetch" command. He would communicate he wanted something, and I would fetch it.