The Future Is Not Set

In the movie we watched, Doc becomes friends with Marty. It almost seems to me like Doc learns there's something more than his success with his inventions. I don't know how to put it in the words of standing up for yourself. Like there's that's why he says, well, fuck it. There's something more important than numbers and like you're not supposed to this,. "I'm going to because I want to see my life"