I came here to say the same thing. Every day is a new chance to succeed, and no single day is your last chance. Happiness is a long game, and the process of getting older is a process of trading simple pleasures for complex ones. Success is a long game. Never give up!
The funny thing about success is that it's highly subjective and sometimes the perception of failure is just a issue of narrow perspective.
If during the course of working toward some arbitrary goal you enjoy yourself and learn something then you have accomplished something that is more important than most end results.
What you do for a living does not define you as a person. It's just the shortcut that others use to categorize other people into easy to quantify values for comparison. You can certainly through the course of your professional life enact change that touches the everyday lives of countless people. The majority of actions that change lives though are the plain, boring, and downright ordinary actions of the majority. The combined machinations of our every day lives and how we impact those directly connected to us are just as important as that next disruptive idea that shifts culture.
Live inspired and find joy in the things that really matter.