I can't think of specific experiences, but I have always been fascinated by the elegance of mathematical proofs. It was natural for me to pursue the subject because even though it didn't always come easy, there was a certain beauty mathematics it that I couldn't ignore.

Starting out as an actuarial science major, I switched to a pure math major because I was seeking a stronger theoretical grounding in mathematics.

The mathematical grounding I acquired helped me be successful on the more math-heavy actuarial exams.

During College:

Being able to successfully complete real analysis and abstract algebra simultaneously despite advice suggesting that it would be too challenging.

 

After College:

Professionally - becoming a credentialed actuary (Fellow of the Casualty Actuarial Society) and leading a team of actuaries for a Fortune 100 insurance company.

Personally: Meeting my wife and starting a family with her.