Life, ultimately boils down to the decisions you made throughout your journey of life. Every decisions you made impacted your life in some ways, either directly or indirectly.
However, its important to make sure that every decision you made did not have a slight ounce of regret in it. It is more beneficial to fail and learn from mistakes, rather than contemplating "What if" scenarios in your head every time you choose not to take action.
We all make mistakes and learn from it. That how humanity has progressed further from since ancient time.