This is a very important moment in the development of a musician.
After each performance an overall analysis should be done with the clarinet teacher. Then you should discuss everything: your access to the stage, your playing, the speed of playing, tone, interpretation, acting on the stage, bowing, your appearance and leaving the stage.
It is good to hear the opinions of other listeners and viewers. Never take all the critics as the argument for the disappointment, but as an indicator to what you should pay more attention to when performing in the future.
You have to comprehend the truth of the saying: A man learns from mistakes.
Taken from my book