What's a song you associate with your biggest mistake?

I used to listen to this song a lot at my IT job. I knew I didn't want the job before I applied for it. When I was selected for the position, I was working at a fast food restaurant, so when I saw the IT pay compared to what I was making, it was only natural to want to take the job. I don't think those 2 years were a waste, but other than spending a lot of time preparing for a Mandarin proficiency exam, I wasn't getting any closer to doing what I wanted to do. In the end, the biggest mistake was listening to my parents (who encouraged me to get that job) instead of trusting myself