Modify it by stopping being so self-critical and pledge yourself to some positive action.
Seelct one of the problems and start doing something positive towards achieving the completion of an attainable short term goal. If you engage in thinking with such negativity, it'll only breed more negativity.
Certainly, you might benefit from seeing and getting the help from a doctor and a determining if there's a diagnosis of depression. Self diagnosis won't get you too far...nor will asking online strangers get you too much further.