I can relate to what you are saying. I am in my 50s and feel like there is no end to the depression and feeling worthless, tense and afraid. I do a useful job so I am told but I feel pointless and a failure . I dont see any point to my life and it seems to me that all the decisions I make always turn out wrong. I feel so sad and pointless most of the time I am just tired of being like this and dont know how to change.