Depending on what could be considered a defining moment, I guess I had two. Not necessarily that deep, but deep enough I guess.
The first defining moment was when I was about 11-12 years old. My mom got me in this small youth group, not for religious purposes, but for friends. I've always struggled with making/keeping them since I'm kind of a loner type, and have always been the unlikable kid. But anyways, I made friends with this 16 year old goth chick and her brother, we all hung out a lot.
One day she gifted me art of a dragon girl. I thought it was the greatest thing, no one has ever given me art, it was always me drawing stuff for other people. Not only that, but that piece of art was gorgeous to me at the time. Upon receiving the art a switch in my brain flipped, I wanted to be an amazing artist just like her so after that I started feverishly drawing every moment of the day.
Drawing has always been part of my life (my mom still has a drawing I did when I was 3 years old), but that day it sort of became something more important to me than just drawing.
My second defining moment was when I started my current comic. It was near the end of 2015, life events have kind of dwindled my driving for drawing at that point, which left me feeling aimless. A few years ago I got into the military to get my mom and I away from her husband at the time who was an emotionally abusive, alcoholic. Things started out great, I was making more money than I had ever seen at the time (given it was my first job), the work started out fun. Although by then it had become gruelingly monotonous, things at home weren't going great with my mom being miserable at her job, and verbally taking it out on me pretty much every day. I started feeling like I was going down the same road, everything started building up, "what's the point? Why even go to work when they'll just shove me in the corner to do the same paperwork over and over again? No one at my work even likes me, they think I'm weird. Why go home when everything there is just miserable?"
Legit I was fighting the urge to cash in my life insurance policy, if you know what I mean, and I wasn't quite ready to talk to anyone about it. People tend to get really uncomfortable/upset when you talk about death and depression to them. On one of the morning drives when I was feeling extra awful, physically forcing myself not to flip the car into oncoming traffic when something just hit me. An idea, or really, a full story popped into my brain. It was a compilations of every awful feeling I've built up so far in my lifetime, but it was solid and satisfying to think about, I had this painful urge to start working on it right away. I've been working on it ever since.
Not sure if those count as 'Defining Moments'. I Googled the term, but tend to overanalyze everything into oblivion. If they're not than you can totally ignore my post... or let me know so I can delete it.