Setbacks are a rule of life; an integral part you cannot avoid. Face them with self-empathy & courage.
It can be anything – a failed -relationship, missed a target or an unsuccessful interview.
You can respond to them in two ways:
Get defensive- blame others for your failure
OR
Be tough on yourself- blame yourself for everything that happened & be angry with yourself.
BUT, none of these outbursts are going to improve your next performance.
You will only get frustrated, which will worsen your situation.