How do you deal with depression without seeking professional help?

Sorry for this. I just can't tell my parents. They are not very open minded. I am always miserable even though life is good in general. I lost the love of my life for some reasons. I have been miserable since then. I tried to move on. Felt ok at first. But got worse recently. I dream of her, think about her all day long and just want to reach out. But the truth is she never loved me and kind of used me and abused me for several years. So I know I can't get back. But I don't know how to deal with this sadness all the time. It's turning to rage and self hurt. I really don't know what to do.
How do you deal with depression without seeking professional help?
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