In life, overcoming challenges and obstacles in many types is required. Battling our struggles and fears determines who we are. Base on experiences, can you determine who you are right now on handling challenges in life?
I'm Not sure I would say that "Battling our struggles and fears determines who we are.".
IMO, they can Help a person. They may Also Hold us Back sometimes. And they will Influence how a person is Perceived by those around them. But I Do Not Believe that Past Experiences define Us in any Totality.
If so, a person who say Drank for 25 Years and who had Unsuccessfully tried to Quit many times would have No Chance of Quitting Today. Or a person who Successfully dealt with the Passing of someone close or a family member should be able to cope with someone Dying Today.
For Me, I define Myself by My Actions in the Present. And my Previous Experiences may put Tools in My Toolbox, they do Not Predicate that I will take them out when they are Needed. Or that I will be Unable to Overcome something that I have Never Overcome before.