I had dabbled in some game programing in Unity (like Unity 1 or 2 at the time) and played around with python. But I hadn't spent much time programming. I was going to school for marketing because when I graduated high school, there were basically no software jobs anywhere near my hometown. But I got an internship at a place that had a single web developer but like 5 clients who had websites. The dev left and I volunteered to build websites, thinking it had to be better than writing about asphalt pumps. They gave me a $5 raise. At that point I realized 2 things.

1. The area around my hometown was starting to have more software jobs (I actually ended up moving and I'm extremely happy I did now).

2. Devs usually make more than marketers.

I already knew I enjoyed programming, I just didn't see it as a realistic career until I got a pay raise I didn't even ask for, and for a job I wasn't qualified to do even.