So you try something and it doesn't work. Does that make you a failure? George Bernard Shaw said that the only real failure in life is the failure to try.  And it is also said that mistakes are proof that you are trying.

Again, failure is the opportunity to begin again more intelligently (Henry Ford).   So - there is plenty of reason to pick yourself up and try again.

Perhaps the most useful part of failure for me is the chance to reflect and work out what the learning has been. What could I do differently next time? How could I improve on the outcome?  What do I take with me that was good?

Next time you feel that you haven't achieved as much as you wanted, use some reflective time to list what was good, what was successful, and another list with all the things that you would do differently - and how you are going to put that into practice.

Let me know how you get on!