Who’s a good NASCAR underdog story I can base a character on?

Hey everyone, I’m working on a passion film project and wanted to get some input from NASCAR fans.

The basic idea is about a kid who eventually develops super speed, but before that, I wanted him to be really into NASCAR. I thought it would be cool if he had a favorite driver he really looks up to—especially someone with an underdog story or a tough childhood.

So I was wondering if there are any drivers who came from a rough background, had to fight their way up, or weren’t expected to succeed but did anyway.

The era doesn’t matter too much to me, past or present is fine.

Would love to hear your suggestions—thanks!