Suspecting Depression. When i feel this.

Hi, I have found below symptoms after some self analysis. I always worry about future and think how good or bad the past was My default perception of most of the things are depressing or saddening I don't know what I want in most of the situations be it career or simple choice of food, clothing etc I don't have curiosity or enthusiasm towards anything. I do anything just for the sake of it. This has affected professional life I think a lot and speak less. I don't know what to say in a discussion I dont have any close emotional relation. At least I feel in this way. I feel as if I am acting in all the situations I avoid social contact, parties, going out etc but I fight with it though I am not sure what to suggest if asked for an opinion on a situation as I am confused I am not suicidal but think if life can be restarted and if my death can solve problems Some days I get depressed but I feel good on other days like a cycle Don't know since when I feel this.