Success in anything important rarely comes without the Five Horsemen of Success: planning, effort, positivity, perseverance and resilience.
Go out there and do your part to change the world. You may not change all you had hoped but the world will be better for the caring demonstrated by your effort.
Failure is much easier to handle if you just think of it as feedback to guide your next effort.
The key to success is effort. The bigger the goal, the greater the effort.
If one insists on calling all unsuccessful efforts failures the meaning of failure is really quite benign. When trying anything new or taking on any challenge, unsuccessful efforts are an essential aspect of skill building.