Instead of asking yourself what you could have done, ask yourself what you can do from now on.
Instead of asking others what they can do for you, ask what you can do for them.
Instead of asking what else do you need to achieve your goals, ask yourself what you could do with what you have.
Instead of asking why you got a negative answer, ask yourself what you must do to get a positive one.
If you are not getting the right answers then you are asking the wrong questions.