What is the best way to escape from positive thinkings and believe in life?

meditation can never hurt... I think. I would try to identify the specific thoughts that cause anxiety and depression or the themes or general pattern of thought and avoid them also check yourself when they pop up and think about something else. id also try thinking about situations more realistically for example if your late to work don't tell yourself your going to get fired its the end of your world bla bla be like oh well I guess its time for the boss to chew me out for a few minutes. if your comfortable talking to people about your problems this would also help a lot. I mean youll dead sooner or later might as well let it find you naturally.

Still your mind. It helps a lot.